Type 25 Metal Water Pipe - Water Pump To Right Cylinder Head (Behind Pulley) - Waterboxer Engines

This stainless steel coolant pipe is a high-quality replacement for the original steel pipe fitted to all 1900cc and 2100cc Waterboxer engines in the VW Type 25 (T25). It connects to the lower right (driver’s side on RHD models) of the water pump and runs beneath the crank pulley towards the right-hand (driver’s side) cylinder head.

Designed to follow the exact factory routing, this pipe forms a critical part of the Waterboxer cooling system. Its role is to carry coolant directly from the water pump to the cylinder head, ensuring even coolant circulation and stable engine temperatures. Any corrosion, internal restriction, or pinhole leaks in this pipe can lead to coolant loss, overheating, and potential engine damage.

Manufactured from durable stainless steel, this upgraded pipe offers vastly improved resistance to rust and corrosion compared to the original mild steel version. It is an ideal long-term solution for vehicles used year-round or stored for long periods, where moisture can attack factory pipes from the inside out. Precision-formed to original specifications, it provides a direct bolt-on fit with no modification required.

How it works

Coolant exits the water pump under pressure and flows through this pipe towards the right cylinder head, helping regulate combustion temperatures and preventing hot spots within the engine. Maintaining unrestricted flow through this pipe is essential for correct thermostat operation and overall cooling efficiency.

Fitment & installation notes

• Fits all 1.9 and 2.1 Waterboxer petrol engines

• Suitable for Syncro and non-Syncro models (see engine codes below)

• Located beneath the crank pulley on the right-hand side (RHD driver’s side)

• We strongly recommend replacing the sealing gasket during installation to ensure a leak-free fit

Recommended fitting part:

• Water pump sealing gasket – Part number: N90168502

Replacing this pipe during cooling system overhauls, water pump replacement, or engine rebuilds is highly recommended. It is a simple yet vital upgrade that improves reliability and protects your engine from cooling-related failures.

Engine compatibility

2WD models (1982–1992):

• DF 1.9 (08/82–07/92)

• DG 1.9 (08/82–07/92)

• DH 1.9 (01/83–07/85)

• EY 1.9 (10/84–07/89)

• GW 1.9 (08/83–07/85)

• DJ 2.1 (08/84–07/92)

• MV 2.1 (08/85–07/92)

• SP 1.9 (08/86–07/89)

• SR 2.1 (08/86–07/92)

Syncro models (from chassis F24-G-000 001>):

• DG 1.9 (08/85–07/92)

• SP 1.9 (08/86–07/89)

• DJ 2.1 (08/85–07/92)

• MV 2.1 (08/85–07/92)

• SR 2.1 (08/85–07/89)

• SS 2.1 (08/85–07/92)