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line pressure valve
I am about to install something just like you speak of into the cold line to hot water heater,,a pressure relief valve...the owners manual says it can be placed in line or a expansion tank for thermal expansion..im using the valve in line -off a tee with pvcpipe for exit but im using a 125psi as to pop before the 155 on heater,.its just a 2nd measure after installing a pressure reducing valve set at 50 -60(much bigger and better)..
-hope it helps
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