Drain hose rubber. Porsche 911 1968-89  ❭  90157132632

Heater Box Drain Hose 

Maintain the efficiency and longevity of your classic Porsche heating system with this OE Match Heater Box Drain Hose. Manufactured to closely match the original factory specification, this ensures moisture and condensation are safely drained away from the heater box, helping to protect surrounding components from corrosion and deterioration.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)

Ideal for routine maintenance or full restoration projects, this OE Match drain hose provides the correct fit and reliable performance expected from an original-style replacement.

What Does the Heater Box Drain Hose Do?

The heater box drain hose plays an important role in the operation of the air-cooled Porsche heating system.

Its functions include:

• Draining condensation and moisture from the heater box.
• Helping prevent water from collecting inside the heating system.
• Protecting the heater box and surrounding bodywork from corrosion.
• Reducing the risk of trapped moisture causing rust or deterioration.
• Maintaining efficient operation of the heating and ventilation system.

Although often overlooked, this simple hose helps preserve both the heating system and the surrounding chassis.

Why Does the Heater Box Drain Hose Fail?

The original drain hose is continually exposed to heat, moisture, road debris and age, causing the rubber material to deteriorate over time.

Common causes of failure include:

• Rubber becoming brittle and cracking with age.
• Splits caused by repeated heat cycles.
• Hardening due to engine bay temperatures.
• Blockages from dirt, leaves or road debris.
• Perishing caused by prolonged exposure to moisture and contaminants.
• Damage during engine or heater system maintenance.

A damaged or blocked drain hose can allow moisture to remain inside the heater box, increasing the risk of corrosion and reducing heating system efficiency.

When Should It Be Replaced?

Replacement is recommended when:

• The hose is cracked, split or hardened.
• Signs of water retention or corrosion are found around the heater box.
• The heating system is being restored or serviced.
• The engine is removed, providing easy access.
• Restoring a classic Porsche to factory specification.
• Carrying out preventative maintenance on an ageing vehicle.

Replacing the drain hose is an inexpensive way to help protect the heating system and surrounding bodywork from long-term moisture damage.

OE Match Features

• OE Match quality replacement.
• Manufactured to replicate original factory dimensions.
• Durable rubber construction.
• Correct fit and routing for factory heater box assemblies.
• Helps maintain proper heater box drainage.
• Suitable for restoration, repair and preventative maintenance.