The valve CAN be turned with pressure on it, but sure helps to relieve BOTH sides before trying to move it. The OEM model suffers from the rubber o-rings tearing after use and allowing water to go where not meant to go under pressure from hookup.
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2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
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