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Water Pressure Relief Valve 1/2" NPT 

# 128-5000
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Adjustable  Water Pressure Relief Valve 1/2" NPT

This spring loaded adjustable water pressure relief valve is perfect for bleeding off excess engine water pressure caused by pressure spikes in an engines cooling system.  water flows freely when water pressure exceeds the set designated pressure.  Keep high pressure spikes from damaging your engine. With the appropriate adapters can be used as an alternative to Mercury #863208A3.

Adjustable from 7-25 PSI. Flow rate: 1.5 GPM at 10 PSI, 5 GPM at 25 PSI. 
MSRP: $104.00
Your Price: $99.99
 You Save: 4% off MSRP!

NOTE: This Item is currently out of stock. Expected Ship Date: 12/31/2026
You may place an order for this part but it will not ship until available. Any other items on your order will also not ship until this part is available. Please call us for more information.
Additonal Info On This Product:

Water Pressure Relief Valve

1/2" NPT

Adjustable 7-25 PSI

This spring loaded adjustable water pressure relief valve is perfect for bleeding off excess engine water pressure caused by pressure spikes in an engines cooling system.  water flows freely when water pressure exceeds the set designated pressure.  Keep high pressure spikes from damaging your engine. Adjustable 7-25 PSI.

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