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Your Vehicle  //  Porsche  //  Cayman 987C / 981C (2005-2016)  //  Cayman S / R 3.4L 987C MKII 2009-12
PorscheCayman 987C / 981C (2005-2016)Cayman S / R 3.4L 987C MKII 2009-12Engine CoolingCoolant Hoses and Pipes (Rear engine cars)

Hose Clips / Screws / Brackets and Fixings

Hose Clips / Screws / Brackets and Fixings

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DISPLAYING 1 to 10 (of 10 products)
Coolant hose clamp. Porsche 997.1 / 997.2 / 987.1 / 987.2 Boxster & Cayman 2005–12 - 99710690200
3
Coolant hose clamp. Porsche 997.1 / 997.2 / 987.1 / 987.2 Boxster & Cayman 2005–12
Special Order item
99710690200
Product Information
Product Information
Coolant Hose Clamp
This clamp forms part of the radiator coolant hose assembly, helping secure the associated coolant hose connection and maintain a reliable seal within the cooling system.
Sold individually

Fits:
Porsche 987.1 Boxster / S 2005 - 2008
Porsche 987.2 Boxster / S 2009 - 2012
Porsche 987C.1 Cayman / S 2006 - 2008
Porsche 987C.2 Cayman / S 2009 - 2012
Porsche 997.1 Carrera 3.6L / 3.8L 2005 - 2008 CABRIO/COUPE
Porsche 997.2 Carrera 3.6L / 3.8L 2009 - 2010 CABRIO/COUPE

Diagram ref no 27.

Manufactured to Porsche's original specifications, this genuine replacement clamp provides precise fitment, durability and dependable fastening under the temperature changes, pressure and vibration experienced during normal vehicle operation.

Ideal for replacing worn, damaged or corroded original clamps during radiator repairs, coolant hose replacement or cooling system maintenance.

What Does This Part Do? – Functions
  • Secure Fastening: Helps hold coolant hose connections firmly in position.
  • Leak Prevention: Supports a secure connection to minimise coolant leakage.
  • Coolant System Reliability: Helps maintain the integrity of the radiator cooling circuit.
  • Vibration Resistance: Reduces the risk of hose connections becoming loose.
  • Original Fitment: Maintains factory-correct cooling system assembly.

Why Replace This Part?
Over time, coolant hose clamps may become corroded, weakened or damaged due to repeated temperature changes, moisture and vibration. A faulty clamp can compromise the hose connection, potentially resulting in coolant leakage and reduced cooling system reliability.

Replacing a worn or damaged clamp with a genuine Porsche component helps restore secure fastening, reduce the risk of coolant loss and maintain dependable engine cooling performance.

When to Replace This Part?
  • Coolant Leaks: Visible leakage around the hose connection.
  • Corrosion: Rust or deterioration affecting clamp strength.
  • Physical Damage: Bent, cracked or deformed clamp.
  • Loose Connection: Clamp no longer secures the hose correctly.
  • Cooling System Repairs: During radiator or coolant hose replacement.

Where Does It Fit on the Car?
Location: Cooling system – radiator coolant hose assembly.

The coolant hose clamp is installed at a designated connection within the radiator coolant hose arrangement, securing the associated hose and helping maintain a reliable cooling system connection.

It forms part of the coolant hose and pipework assembly on compatible Porsche 987 Boxster, Cayman and 997 Carrera models.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99710690200
99710690200

The product you are viewing cross references to these numbers
Coolant Hose Connecting Piece. Porsche 987 Boxster / 987C Cayman / 997 - 99710625502
4
Coolant Hose Connecting Piece. Porsche 987 Boxster / 987C Cayman / 997
Special Order item
99710625502
Product Information
Product Information
Coolant Hose Connecting Piece
This connecting piece forms part of the radiator coolant hose assembly, providing a secure connection between associated coolant hoses and pipework. It helps maintain an effective coolant circulation system, ensuring reliable coolant flow and supporting consistent engine temperature regulation.

Fits:
Porsche 987.1 Boxster / S 2005 - 2008
Porsche 987.2 Boxster / S 2009 - 2010
Porsche 987C.1 Cayman / S 2006 - 2008
Porsche 987C.2 Cayman / S 2009 - 2012
Porsche 997.1 Carrera 2005 - 2008
Porsche 997.1 Turbo 2007 - 2009
Porsche 997.2 Carrera 2009 - 2012
Porsche 997.2 Turbo 2010 - 2013
Porsche 997 GT3 2007 - 2010

Diagram ref no 11

Manufactured to Porsche's original specifications, this genuine replacement connector offers precise fitment, durability and resistance to the temperature and pressure demands of the cooling system.

Ideal for replacing cracked, damaged or leaking original connectors during radiator repairs, coolant hose replacement or routine cooling system maintenance.

What Does This Part Do? – Functions
  • Secure Connection: Joins radiator coolant hoses and associated cooling system pipework.
  • Coolant Circulation: Supports consistent coolant flow through the radiator circuit.
  • Leak Prevention: Helps maintain a secure, leak-resistant connection.
  • Temperature Resistance: Designed to withstand normal cooling system temperatures and pressures.
  • Original Fitment: Maintains Porsche factory cooling system specifications.

Why Replace This Part?
Over time, coolant hose connecting pieces can become brittle, cracked or damaged due to repeated temperature changes, coolant pressure and ageing. A deteriorated connector may cause coolant leaks, pressure loss and reduced cooling system efficiency.

Replacing a damaged connector with a genuine Porsche component helps restore secure hose connections, reduce the risk of coolant loss and maintain reliable engine cooling performance.

When to Replace This Part?
  • Coolant Leaks: Visible coolant escaping around the connector.
  • Physical Damage: Cracked, broken or deformed connecting piece.
  • Poor Sealing: Loose or leaking coolant hose connections.
  • Material Deterioration: Signs of ageing, brittleness or damage.
  • Cooling System Repairs: During radiator or coolant hose replacement.

Where Does It Fit on the Car?
Location: Front cooling system – radiator coolant hose assembly.

The coolant hose connecting piece is installed within the radiator coolant pipework, joining the associated coolant hoses and helping maintain a secure connection between cooling system components. It forms part of the front radiator hose arrangement on compatible Porsche 987 and 997 models. 

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99710625502
99710625502

The product you are viewing cross references to these numbers
Coolant pipe seal. Porsche Boxster / Cayman / 991 / 992 - 9A110621500, 0PB121437, 273.760
2
Coolant pipe seal. Porsche Boxster / Cayman / 991 / 992
0PB121437/1
Product Information
Product Information
Coolant pipe seal. Pipe to Water Pump & Thermostat Housing.

Fits:
Porsche 987.2 Boxster 2009-12
Porsche 981 Boxster 2012-16
Porsche 981 Boxster Spyder 2016
Porsche 982 Boxster GTS 4.0 2019>>
Porsche 982 Boxster Spyder 2019>>
Porsche 987C Cayman 2009-12
Porsche 981C Cayman 2014-16
Porsche 981C Cayman GT4
Porsche 982C Cayman GTS 4.0L 2019>>
Porsche 982C Cayman GT4 2019>>
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13
Porsche 991.1 Carrera 2012-16
Porsche 991.2 Carrera 2017-19
Porsche 991 Turbo 2014-20
Porsche 991 GT3 1014>>
Porsche 992.1 Carrera 2020>>
Porsche 992 Turbo 2020>>

Click 'Zoom in' for large parts diagram.
Diagram ref no 12

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

0PB121437
9A110621500
0PB121437
273.760

The product you are viewing cross references to these numbers
Radiator hose retaining clamp. Porsche 997.1 / 997.2 / 987.1 / 987.2 Boxster & Cayman 2005–12 - 99751274201, 99710690100
2
Radiator hose retaining clamp. Porsche 997.1 / 997.2 / 987.1 / 987.2 Boxster & Cayman 2005–12
Special Order item
99751274201
Product Information
Product Information
Radiator hose retaining clamp
This retaining clamp is designed to secure the radiator coolant hose assembly in its correct position, helping maintain proper hose alignment and prevent unwanted movement within the cooling system.
Sold each

Fits:
Porsche 987.1 Boxster / S 2005 - 2008
Porsche 987.2 Boxster / S 2009 - 2012
Porsche 987C.1 Cayman / S 2006 - 2008
Porsche 987C.2 Cayman / S 2009 - 2012
Porsche 997.1 Carrera 3.6L /  3.8L 2005 - 2008 CABRIO/COUPE
Porsche 997.2 Carrera 3.6L /  3.8L  2009 - 2010 CABRIO/COUPE

Diagram ref no 

Designed to meet Porsche's original equipment specifications, this replacement component provides secure fastening and reliable support for the associated radiator hose connections.

Ideal for replacing worn, damaged or missing original clamps during radiator repairs, coolant hose replacement or cooling system maintenance.

Previous Porsche Part Number: 99710690100.

What Does This Part Do? – Functions
  • Secure Hose Retention: Helps hold radiator coolant hoses firmly in position.
  • Correct Alignment: Maintains proper positioning of associated cooling system connections.
  • Vibration Resistance: Reduces unwanted hose movement during vehicle operation.
  • Component Support: Helps protect hose connections from unnecessary mechanical stress.
  • Original Fitment: Supports factory-correct cooling system assembly.

Why Replace This Part?
Over time, radiator hose retaining clamps can become worn, weakened or damaged due to heat exposure, vibration and ageing. A damaged or missing clamp may allow excessive hose movement, potentially placing additional stress on the cooling system connections.

Replacing it with a genuine Porsche component helps restore secure hose retention, maintain correct alignment and support the reliability of the radiator cooling system.

When to Replace This Part?
  • Physical Damage: Cracked, broken or deformed retaining clamp.
  • Loose Hoses: Excessive movement around radiator hose connections.
  • Corrosion: Visible deterioration affecting clamp strength.
  • Missing Clamp: Original retaining component has been lost or removed.
  • Cooling System Repairs: During radiator or coolant hose replacement.

Where Does It Fit on the Car?
Location: Front cooling system – radiator coolant hose assembly.

The retaining clamp is installed within the front radiator assembly, securing the associated coolant hose connection in its designated position. It helps maintain correct hose routing and alignment around the radiator mounting area.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99751274201
99751274201
99710690100

The product you are viewing cross references to these numbers
Rubber isolator bush pipe mounting bracket. Porsche 986 / 987 / 996 / 997 - 99951123141
3
Rubber isolator bush pipe mounting bracket. Porsche 986 / 987 / 996 / 997
Special Order item
99951123141
Product Information
Product Information
Rubber isolator bush pipe mounting bracket. 
Sold each


Fits:
Porsche 986 Boxster - 1997 to 2004
Porsche 987.2 Boxster - 2009 to 2012
Porsche 987.2 Cayman - 2009 to 2012
Porsche 996 - 1997 to 2005
Porsche 996 GT3 - 1999 to 2004
Porsche 997.1 / 997.2 - 2005 to 2012
Porsche 997 GT3 - 2007 to 2012

Used in various locations on air conditioning and water coolant solid pipes

Diagram ref no 36



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99951123141
99951123141

The product you are viewing cross references to these numbers
Water / Coolant pipe O-ring 22 x 3 mm for Porsche 911 (997.2 / 991) / Boxster (987.2 / 981 / 982) / Cayman (987C.2 / 981C / 982C) - 99970751740, 99970751741
1
Water / Coolant pipe O-ring 22 x 3 mm for Porsche 911 (997.2 / 991) / Boxster (987.2 / 981 / 982) / Cayman (987C.2 / 981C / 982C)
Special Order item
99970751741
Product Information
Product Information
Water / Coolant pipe O-ring 22 x 3 mm
This Porsche Genuine OE O-Ring (Part No. 99970751741) is a precision-engineered sealing ring (22 x 3 mm) used within the engine cooling system, specifically at water/coolant pipe connections. It is commonly referred to as a coolant pipe O-ring, water inlet O-ring, or thermostat housing seal.
Sold individually

Fits:
O-Ring 99970751741 is widely used across multiple Porsche models, including:
Porsche 911 (997.2 / 991)
Porsche Boxster (987.2 / 981 / 982)
Porsche Cayman (987C.2 / 981C / 982C )

Fitment / Position on car
•  Fitting position: Engine cooling system
•  Location: At coolant pipe joints / water inlet connections / thermostat housing
•  System: Engine cooling / coolant circulation

Cross Reference / Superseded Numbers: 99970751740 - replaced by 99970751741

The Porsche Genuine OE Coolant Pipe O-Ring 99970751741 is a small but essential sealing component used across many Porsche models. It ensures a leak-free connection within the cooling system, maintaining proper coolant flow, pressure, and engine temperature control. As a genuine Porsche part, it guarantees exact fitment and durability.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99970751741
99970751740
99970751741

The product you are viewing cross references to these numbers
Water / Coolant pipe O-ring 22 x 3 mm for Porsche 911 (997.2 / 991) / Boxster (987.2 / 981 / 982) / Cayman (987C.2 / 981C / 982C) - 99970751740, 99970751741
1
Water / Coolant pipe O-ring 22 x 3 mm for Porsche 911 (997.2 / 991) / Boxster (987.2 / 981 / 982) / Cayman (987C.2 / 981C / 982C)
99970751741/1
Product Information
Product Information
Water / Coolant pipe O-ring 22 x 3 mm
This OE Match O-Ring (22 x 3 mm) is a high-quality replacement sealing component designed to meet original Porsche specifications for fit, durability, and performance. This O-ring is used within the engine cooling system, sealing coolant pipe connections to prevent leaks and maintain system pressure.
Sold individually

Fits:
O-Ring 99970751741 is widely used across multiple Porsche models, including:
Porsche 911 (997.2 / 991)
Porsche Boxster (987.2 / 981 / 982)
Porsche Cayman (987C.2 / 981C / 982C )

This O-ring is commonly used across a wide range of Porsche models and is essential when removing or reinstalling coolant pipes, housings, or related components. As with all sealing elements, it should always be replaced during servicing to ensure optimal performance and prevent future leaks.

Fitment & Application:
•  Suitable for various Porsche models
•  Commonly used in engine cooling systems
•  Function: Prevents coolant leaks and maintains system pressure
•  Position: Coolant pipes / hose connections / housing joints
•  Size: 22 mm inner diameter x 3 mm thickness
•  Sold: Individually

Cross Reference / Superseded Numbers: 99970751740 - replaced by 99970751741

Coolant system O-rings are exposed to constant heat and chemical exposure, causing them to harden, crack, or lose elasticity over time. A failing seal can lead to coolant leaks, overheating, and potential engine damage. Replacing O-rings during servicing ensures proper sealing, prevents leaks, and maintains reliable cooling system operation.

When to replace
•  During coolant pipe or housing removal
•  Visible coolant leaks or residue
•  O-ring appears flattened, brittle, or cracked
•  Preventative replacement during cooling system service
•  After engine overheating incidents

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99970751741
99970751740
99970751741

The product you are viewing cross references to these numbers
Water tube gasket, Cyl 1-3. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2 - 9A110231200, 0PB121228B
3
Water tube gasket, Cyl 1-3. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2
Special Order item
0PB121228B::1
Product Information
Product Information
Water tube gasket, cyl 1-3.

Fits:
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2014-18

Diagram ref no 7

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

0PB121228B
9A110231200
0PB121228B

The product you are viewing cross references to these numbers
Water tube gasket, Cyl 4-6. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2 - 9A110232200, 0PB121327C
2
Water tube gasket, Cyl 4-6. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2
Special Order item
0PB121327C
Product Information
Product Information
Water tube gasket, cyl 4-6.

Fits:
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12
Porsche 997.2 Carrera 2009-12
porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2014-18

Diagram ref no 8

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

0PB121327C
9A110232200
0PB121327C

The product you are viewing cross references to these numbers
Water tube gasket, Cyl 4-6. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2 - 9A110232200, 280.370, 0PB121327C
3
Water tube gasket, Cyl 4-6. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2
0PB121327C/1
Product Information
Product Information
Water tube gasket, cyl 4-6.

Fits:
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2014-18

Diagram ref no 8

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

0PB121327C
9A110232200
280.370
0PB121327C

The product you are viewing cross references to these numbers
DISPLAYING 1 to 10 (of 10 products)
Also found on these pages
About Hose Clips / Screws / Brackets and Fixings

Hose Clips, Screws, Brackets & Fixings for Reliable Coolant System Performance

Hose clips, screws, brackets and fixings are the essential hardware that keeps your coolant hoses, pipes and auxiliary lines securely in place. These compact but critical components maintain stable pressure, prevent coolant leaks, and ensure the entire cooling system functions efficiently under varying temperatures and engine loads. Whether you're upgrading cooling components, performing routine maintenance or completing a restoration project, dependable hose fixings are vital to long-term engine health.

What Hose Clips, Screws, Brackets & Fixings Do

Cooling systems operate under constant pressure and temperature fluctuations.

These fittings perform several key roles:

  • Securing coolant hoses and pipes to prevent movement, abrasion or disconnection
  • Maintaining a reliable seal against leaks and pressure drops
  • Supporting correct routing of hoses throughout the engine bay
  • Preventing vibration damage by keeping lines firmly positioned
  • Ensuring proper airflow and coolant flow by holding components safely in place

From simple worm-drive hose clamps to engineered brackets made for specific vehicle models, these components are designed to ensure stability and performance.

Why Hose Clips & Fixings Commonly Fail

Over time, coolant system fixings endure significant strain from heat cycles, vibration and coolant exposure.

Common reasons for failure include:

  • Corrosion due to moisture or coolant seepage
  • Material fatigue or weakened tension from age
  • Cracked or brittle brackets caused by heat stress
  • Over-tightening or incorrect installation leading to thread damage
  • Degraded rubber insulators on mounting brackets
  • Hose expansion causing clamps to loosen

When these components weaken, the system can no longer maintain proper pressure, often resulting in leaks, overheating, or hose detachment.

Why You Should Replace Worn Hose Clips & Fixings

Replacing worn or damaged fixings with high-quality, precision-made replacement components designed to match original performance levels ensures your cooling system remains secure, leak-free and efficient.

Benefits of replacing them include:

  • Restored clamping strength and sealing reliability
  • Reduced risk of coolant leaks and overheating
  • Proper alignment and support for coolant hoses and pipes
  • Improved durability under heat and vibration
  • Enhanced long-term cooling system resilience

Quality fixings are a small investment that protect major engine components, ensuring dependable performance in both daily driving and high-demand conditions.

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