Filler / pressure cap

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The design of the heat exchanger filler necks and pressure caps used on Vetus Diesel engines was changed in 2019

The original type of filler cap, STM9507 and STM1017 are no longer available.

The original type of filler neck, STM3750 and STM1515 are also no longer available.

The new pressure cap is black plastic and the same one is used for heat-exchanger cooled engines and keel-cooled engines - regardless of whether they have a calorifier or expansion tank fitted.

The cap vents at 1.0 bar and a small length of pipe can be used to drain any coolant overflow into the bilge.

If you are replacing the original metal pressure cap with the new black plastic cap, you must also replace the filler neck at the same with the new type, part reference: 18-14715.

Replacement of the filler neck is relatively simple: unscrew the original and screw in the new one, then tighten it.

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NEW filler / pressure cap 18-14715--- New design filler / pressure caps for all M-Series, P- Series and VH-Series Vetus Diesel engines. Used on new engines since 2019. This cap is used for heat-exchanger cooled engines and keel-cooled engines, regardless of whether they have a calorifier or expansion tank fitted. The cap vents at 1.0 bar and a small length of pipe can be used to drain any coolant overflow into the bilge. This replaces STM9507 and STM1017 (which are no longer available) but MUST be used with the new-design filler neck - please order a filler neck as well if you require one. Part reference: 18-14715	£16.90
NEW filler neck 18-14649--- New-design filler neck for heat exchanger for all M-Series, P- Series and VH-Series Vetus Diesel engines. Used on new engines since 2019. This version is for all engines, heat-exchanger or keel cooled, regardless of whether they have an expansion tank or calorifier fitted. This replaces STM3750 and STM1515 but MUST be used with the new-style black plastic filler cap. This should be ordered together with the new-type black filler cap if you are replacing the earlier metal caps. Product code: 18-14649	£15.90