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Porsche > Cayman 987C / 981C (2005-2016) > Cayman S / R 3.4L 987C MKII 2009-12 > Engine Cooling > Coolant Hoses and Pipes (Rear engine cars) >

Coolant Hoses - Centre Section

Coolant Hoses - Centre Section

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DISPLAYING 17 to 25 (of 25 products)
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O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991 - 99610680103
9
O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991
Special Order item
99610680103
Product Information
Product Information
O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12

Porsche 981 Boxster 2012-16 
Porsche 981 Boxster Spyder 2016 
Porsche 981 Cayman 2014-16 
Porsche 981 Cayman GT4 2016 

Porsche 718 (982) Boxster 2017>> 
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>

Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

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Related, superseded, cross reference or alternative numbers for comparison.

99610680103
99610680103

The product you are viewing cross references to these numbers
O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991 - 99610680103 - ORS161125
9
O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991
99610680103/1
Product Information
Product Information
O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12

Porsche 981 Boxster 2012-16 
Porsche 981 Boxster Spyder 2016 
Porsche 981 Cayman 2014-16 
Porsche 981 Cayman GT4 2016 

Porsche 718 (982) Boxster 2017>> 
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>

Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

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

99610680103
99610680103

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O-ring seal water pipe. Porsche 987 Boxster / 987 Cayman - 99610680107
2
O-ring seal water pipe. Porsche 987 Boxster / 987 Cayman
Special Order item
99610680107
Product Information
Product Information
O ring seal water pipe, 39.3 x 3.53 mm
This original Porsche sealing ring is used in the engine cooling system, helping seal the coolant pipe connection and prevent coolant leaks.
Sold individually, 

Fits:
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2005 - 2008
Porsche 987C.2 Cayman 2009 - 2012

Diagram ref no 39

This O-ring is used on selected Porsche 987 Boxster and Cayman cooling system pipework.

What This Part Does / Functions
•  Seals the water pipe / coolant pipe connection
•  Helps prevent coolant leaks
•  Maintains cooling system pressure
•  Supports correct coolant flow through the engine and radiator circuit
•  Helps prevent air entering the cooling system
•  Replaces a hardened, flattened, cut or leaking original O-ring
•  Provides correct OE Porsche size, material and fitment
•  Supports correct reassembly after coolant pipe or hose service.

Why Replace This Part?
Coolant O-rings are exposed to heat cycles, coolant pressure, vibration and age-related rubber deterioration. Over time, the seal can harden, flatten, crack or lose elasticity. A worn O-ring may allow coolant seepage from the pipe connection, leading to coolant loss, pressure loss or low coolant warnings. Replacing it with a Genuine Porsche OE water pipe O-ring helps restore the correct seal and supports reliable cooling system operation.

Common Symptoms of a Failed Water Pipe O-Ring
•  Coolant leak around the water pipe connection
•  Dried coolant residue near the pipe joint
•  Low coolant warning
•  Coolant smell from the engine bay
•  Cooling system pressure loss
•  Air entering the cooling system
•  O-ring found flattened, cut or hardened during inspection
•  Coolant seepage after previous pipe or hose work.

When to Replace This Part
•  Whenever the water pipe or coolant pipe is removed
•  During coolant hose or pipe replacement
•  If coolant is leaking from the pipe connection
•  If the O-ring is hardened, flattened, cracked or damaged
•  During cooling system overhaul or repair
•  When replacing related coolant pipes, hoses or housings
•  After separating the water pipe connection
•  Whenever Porsche workshop procedure recommends replacing the seal after removal.

Where It Fits on the Car
This O-ring fits in the engine cooling system water pipe / coolant pipe connection. It is commonly shown in Porsche cooling diagrams in the feed and return water hose / coolant hose centre section area. Correct installation is important. The sealing surface should be clean, and the O-ring should be fitted without twisting, pinching or damage.

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

99610680107
99610680107

The product you are viewing cross references to these numbers
O-ring seal water pipe. Porsche 987 Boxster / 987 Cayman - 99610680107 - ORS23778
2
O-ring seal water pipe. Porsche 987 Boxster / 987 Cayman
99610680107/1
Product Information
Product Information
O ring seal water pipe, 39.3 x 3.53 mm
This OE Match O-ring seal is a replacement coolant pipe sealing ring used within the engine cooling system. It is designed to match the original-style fitment and function, helping restore a secure seal at the water pipe joint.
Sold individually

Fits:
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2005 - 2008
Porsche 987C.2 Cayman 2009 - 2012

Diagram ref no 39

The O-ring seals the water pipe connection to prevent coolant seepage or pressure loss. A correctly fitted seal helps maintain cooling system integrity, stable coolant circulation, and reliable engine temperature control.

Functions
•  Replaces the water pipe O-ring seal
•  Seals the coolant / water pipe connection
•  Helps prevent coolant leaks and seepage
•  Supports correct cooling system pressure
•  Suitable for water pipe, thermostat, radiator hose, or coolant system service
•  Replaces hardened, flattened, cracked, swollen, or damaged
•  O-rings OE Match replacement for Porsche 987 cooling system repair

Why Replace This Part?
Coolant O-rings can harden, flatten, crack, swell, or lose sealing ability due to heat cycles, coolant exposure, pressure, age, and previous service work. A worn or damaged O-ring may cause coolant leaks, low coolant warnings, pressure loss, overheating, or residue around the pipe connection. Replacing the seal helps restore proper coolant system sealing.

When to Replace This Part
•  Coolant is leaking around the water pipe connection
•  The water pipe or related hose has been removed
•  The original O-ring is hard, flattened, cracked, swollen, or damaged
•  Cooling system pressure loss is being investigated
•  Low coolant warnings are present
•  Preventative replacement is required during cooling system service
•  The vehicle is undergoing Porsche 987 Boxster or Cayman cooling system repair

Where it fits on the car
This O-ring fits at the water pipe connection within the engine cooling system on Porsche 987 Boxster and Cayman models. Exact position can vary depending on engine type and coolant pipe layout.

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

99610680107
99610680107

The product you are viewing cross references to these numbers
Water Coolant Distributor Tube SUPPLY. Porsche 987 Boxster / Cayman / 997 - 99710615204, 99710615203
3
Water Coolant Distributor Tube SUPPLY. Porsche 987 Boxster / Cayman / 997
Special Order item
99710675204
Product Information
Product Information
Water Coolant Distributor Tube. SUPPLY

porsche

Fits:
Porsche 987 Boxster MKI & MKII 2005>>
Porsche 987C Cayman MKI & MKII 2005>>
Porsche 997 Carrera 3.6L / 3.8L 2005-12
Porsche 997 Turbo MKI & MKII 2007>>
Porsche 997 GT3 2007-11

This product supersedes Porsche's old part numbers:
- 99710615203

Click 'Zoom in' for large parts diagram.
Diagram ref no 8.

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

99710675204
99710615204
99710615203

The product you are viewing cross references to these numbers
Water Coolant Distributor Tube SUPPLY. Porsche 987 Boxster / Cayman / 997 - 99710615204, 99710615203
3
Water Coolant Distributor Tube SUPPLY. Porsche 987 Boxster / Cayman / 997
99710675204/1
Product Information
Product Information
Water Coolant Distributor Tube. SUPPLY

oematch

Fits:
Porsche 987 Boxster MKI & MKII 2005>>
Porsche 987C Cayman MKI & MKII 2005>>
Porsche 997 Carrera 3.6L / 3.8L 2005-12
Porsche 997 Turbo MKI & MKII 2007>>
Porsche 997 GT3 2007-11

This product supersedes Porsche's old part numbers:
- 99710615203

Click 'Zoom in' for large parts diagram.
Diagram ref no 8.

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

99710675204
99710615204
99710615203

The product you are viewing cross references to these numbers
Water pipe return line. Porsche 987 Boxster / 987C Cayman / 997 - 99710672003, 99710672001, 99710672002
3
Water pipe return line. Porsche 987 Boxster / 987C Cayman / 997
Special Order item
99710672003
Product Information
Product Information
Water pipe. RETURN LINE.

porsche

Fits:
Porsche 987 Boxster MKI 2005-08
Porsche 987 Boxster MKII 2009-12
Porsche 987C Cayman MKI 2006-08
Porsche 987C Cayman MKII 2009-12

Porsche 997 Carrera 3.6L / 3.8L MKI 2005-08 COUPE / CABRIO
Porsche 997 Carrera 3.6L / 3.8L MKII 2009-12 COUPE / CABRIO / TARGA
Porsche 997 TURBO / TURBO S / GT2 / GT2 RS 2007>>
Porsche 997 GT3 2007-11

Click 'Zoom in' for large parts diagram.
Diagram ref no 2

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

99710672003
99710672003
99710672001
99710672002

The product you are viewing cross references to these numbers
Water pipe return line. Porsche 987 Boxster / 987C Cayman / 997 - 99710672003, 99710672001, 99710672002 - 89376
3
Water pipe return line. Porsche 987 Boxster / 987C Cayman / 997
99710672003/1
Product Information
Product Information
Water pipe. RETURN LINE.

oematch

Fits:
Porsche 987 Boxster MKI 2005-08
Porsche 987 Boxster MKII 2009-12
Porsche 987C Cayman MKI 2006-08
Porsche 987C Cayman MKII 2009-12

Porsche 997 Carrera 3.6L / 3.8L MKI 2005-08 COUPE / CABRIO
Porsche 997 Carrera 3.6L / 3.8L MKII 2009-12 COUPE / CABRIO / TARGA
Porsche 997 TURBO / TURBO S / GT2 / GT2 RS 2007>>
Porsche 997 GT3 2007-11

Click 'Zoom in' for large parts diagram.
Diagram ref no 2

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

99710672003
99710672003
99710672001
99710672002

The product you are viewing cross references to these numbers
Water tube return. Porsche 987 Boxster / 987C Cayman - 98710665204, 98710665203, 98710665202
5
Water tube return. Porsche 987 Boxster / 987C Cayman
Special Order item
98710665204
Product Information
Product Information
Water tube return.

porsche

Fits:
Porsche 987.1 Boxster 2.7L 2005-08 Tiptronic Transmission
Porsche 987.1 Boxster 3.2L / 3.4L 2005-08 
Porsche 987.2 Boxster 2.9L 2009-12 PDK Transmission
Porsche 987.2 Boxster 3.4L 2005-08
Porsche 987C.1 Cayman 2.7L 2006-08 Tiptronic Transmission
Porsche 987C.1 Cayman 3.4L 200-08
Porsche 987C.2 Cayman 2.9L 2009-12 PDK Transmission
Porsche 987C.2 Cayman 3.4L 2009-12

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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

98710665204
98710665204
98710665203
98710665202

The product you are viewing cross references to these numbers
DISPLAYING 17 to 25 (of 25 products)
1 2
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About Coolant Hoses - Centre Section

Coolant Hoses – Centre Section | Reliable Cooling for Porsche Performance

The centre section coolant hoses are vital components of your Porsche’s engine cooling system, responsible for circulating coolant between the front and rear of the vehicle. These hoses maintain consistent coolant flow through the radiator and engine, ensuring optimal temperature regulation and preventing overheating — essential for both performance and longevity.

At Design911, we supply a full range of genuine and high-quality coolant hoses in the centre section for Porsche models including 911, Boxster, Cayman. Each hose is engineered to deliver factory-accurate fitment, high heat resistance, and long-lasting durability under the extreme pressures of Porsche’s high-performance cooling systems.

What Do Centre Section Coolant Hoses Do?

Coolant hoses act as the lifelines of your Porsche’s cooling system. The centre section hoses connect key parts of the cooling circuit, helping to:

  • Transfer coolant between the engine, radiator, and water pump.
  • Regulate engine temperature during all driving conditions.
  • Maintain system pressure for consistent cooling performance.
  • Prevent overheating and protect the engine from thermal stress.

Their design ensures smooth, efficient coolant flow — especially important in Porsche models with long mid- or rear-engine coolant routing systems.

Why Do Coolant Hoses Fail?

Over time, coolant hoses are exposed to constant pressure, high temperatures, and fluid corrosion. This can lead to:

  • Rubber degradation or cracking from heat cycling.
  • Coolant leaks due to worn hose ends or clamps.
  • Swelling or soft spots caused by chemical breakdown.
  • Abrasion damage from contact with nearby components.
  • Age-related hardening, reducing flexibility and sealing strength.

Common signs of hose failure include visible cracks, coolant puddles under the car, engine temperature fluctuations, or low coolant levels.

Why Replace Faulty Coolant Hoses?

A weakened or leaking coolant hose can quickly lead to overheating, engine damage, or complete coolant loss. Replacing worn hoses ensures your Porsche’s cooling system operates safely and efficiently.

Benefits of replacement include:

  • Restored, leak-free coolant circulation.
  • Improved temperature control and engine protection. 
  • Prevention of overheating and costly repairs.
  • Manufacturer-quality construction and precision fit.

All hoses in this range are made from high-performance rubber compounds and reinforced materials, designed to meet exacting standards for flexibility, strength, and heat resistance.

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