Type 25 Water Hose Double T-Piece - 1900cc Waterboxer Engines

This engine coolant double T-piece is a direct replacement junction used in the cooling system of all 1900cc Waterboxer engines fitted to VW Type 25 / T3 buses from 1983 onwards. It acts as a central connection point, allowing multiple coolant hoses to join and distribute coolant efficiently throughout the engine’s cooling circuit.

The double T-piece plays a vital role in managing coolant flow between the engine, radiator, expansion tank, and heater circuit. Over time, original plastic T-pieces can become brittle due to constant heat cycles, pressure, and exposure to coolant additives, often leading to cracks, leaks, or sudden failure. Replacing a tired or leaking T-piece is essential to maintaining cooling system integrity and preventing coolant loss or overheating.

Manufactured to original specifications, this replacement double T-piece provides a precise fit with standard coolant hoses and restores correct factory coolant routing. It is ideal for use during cooling system overhauls, hose replacement, or preventative maintenance on ageing Waterboxer engines.

How it works

Coolant flows through the T-piece from one hose to multiple circuits, allowing balanced distribution to different parts of the cooling system. This ensures consistent engine temperature regulation and proper circulation under all driving conditions.

Fitment & installation notes

• Fits all 1.9 Waterboxer petrol engines

• Suitable for VW Type 25 / T3 models from 1983 onwards

• Direct replacement for the original double T-junction

• Compatible with standard factory coolant hoses

• Recommended to inspect hoses and clamps during installation

Replacing this component as part of routine cooling system maintenance helps eliminate one of the common age-related failure points on Waterboxer engines.

Engine compatibility

• All 1.9 Waterboxer engines

• Production years: 1983–1992