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The problem I have with that check valve is in draining the hot water heater for winter storage. I was hesitate about removing that fitting thinking that I might damage the heater tank so normally I just apply air pressure and try to blow out as much water from the tank through the faucet and then add the good old pink stuff.
 

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If I remember right that check valve is located right at the tank so putting in a bypass T to drain the tank is not practical, not to mention that the location of the tank makes working on it difficult. The use of the relief valve to drain the tank might be workable, but I think I tried that in the past and was not successful.
 
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