adam424 take out the washer/screen and flip it around and put it back in the hole. When you install your hose to suck up the antifreeze the hose pushes on the washer /screen to keep the check valve open. Works perfect. Had the same problem last year doing my winterizing the first time on my 3791rd camper. Service guy gave me that tip,he said he,s figured out the valves are stronger then the pump to overcome the spring to suck it open. Also when done winterizing,flip back the washer/screen so it stays closed for next year camping.
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