On my coach the fitting is a female 1/4" -27 national pipe thread (NPT). I use a male air coupler plug. That is the fitting at the end of an air hose. I use to blowout the water lines with my air compressor then attach a 1/4" siphon hose and jug and flush out the pump with antifreeze.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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