I needed to replace my RV water heater and the block check valve was too bad to use with the new heater. My local RV shop didn't have a workable check valve (believe it or not). However, I placed an order and it arrived within two days. I wrapped it around the threads with lots of teflon tape (pipe lube would work too) and it works great! It was a very easy install and I am very happy with how it works.
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