Type 25 Metal Water Pipe - Water Pump To Thermostat - 1986-92

This mild steel metal water pipe is a direct replacement coolant pipe that fits between the water pump and the thermostat housing on 1900cc and 2100cc petrol Waterboxer engines fitted to VW Type 25 / T3 buses.

The pipe features a flanged end that bolts directly to the water pump, while the opposite end connects to the thermostat housing via a rubber hose, secured with hose clips. This rigid section of pipe provides a durable, heat-resistant coolant path in an area where rubber hoses alone would be exposed to excessive heat and movement.

Manufactured from good-quality mild steel, this pipe is designed to match the original factory routing and dimensions, ensuring unrestricted coolant flow and long service life.

What this part does and how it works

Coolant exits the water pump through the flanged connection and flows through this metal pipe toward the thermostat housing. The thermostat then regulates coolant flow based on engine temperature, directing coolant through the radiator once operating temperature is reached. A straight, corrosion-free pipe here is essential for:

• Consistent coolant circulation

• Accurate thermostat operation

• Stable engine temperatures

• Reduced risk of hose fatigue or collapse

Corroded or weakened original pipes can restrict flow or cause leaks at the flange or hose connection—making replacement critical during cooling system servicing or restoration.

Fitment

• Vehicle: VW Type 25 / T3

• Years: 1985–1992 (from chassis F24-G-000 001>>)

• Engines: 1900cc & 2100cc petrol Waterboxer

• Application: Water pump to thermostat metal pipe

Engine code compatibility

• DG: 1.9 (1985–1992)

• SP: 1.9 (1985–1992)

• DF: 1.9 (1982–1987)

• DJ: 2.1 (1985–1992)

• MV: 2.1 (1987–1992)

• SR: 2.1 (1987–1992)

• SS: 2.1 (1987–1992)

Quality

• Good quality mild steel

• OE-style shape and routing

• Designed for durability in high-heat environments

Fitting requirements (sold separately)

• 2 × 47mm hose clips: N0164091

Fitting notes

• Always inspect the rubber hose to the thermostat housing and replace if perished

• Clean the water pump flange surface before installation

• Torque mounting bolts evenly

• Refill with the correct coolant and bleed the cooling system thoroughly after fitting

A robust OE-style replacement that plays a key role in reliable coolant circulation, thermostat control, and long-term Waterboxer engine health.