This is a must for all jet boats. This spring loaded adjustable from 7-25psi water pressure
relief valve system 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. This is the complete kit. Run directly from your jet drives  to the fittings supplied.
Simply adjust your water temperature at idle using the gate valve supplied. Connect a
water pressure gauge to your engine and monitor the pressure. Adjust the spring loaded
install your kit and how it works...

(Video One)  

(Video Two)
Complete Kit - $95.00
Choose Engine hose size