I think it's a bad attempt at stopping water hammer. I mean why make the distance between the tee and the cap as long as he did?
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That is correct. As municipalities install check valves throughout water lines they (the water lines) can't handle the expansion of the water. You can also install a water pressure regulator if your incoming pressure is above 50 psi.
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Any suggestions on a work bench top? I'm thinking 3/4" plywood then 3/4" MDF I need a good hardwood to lay on the MDF ? Ideas?
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If the vent was plugged the water heater would not try to lite at all and the vent motor would just keep running until the air proving switch was made. My bet is the flame rod or a combo of the flame igniter/sensor needs cleaning. Good luck.