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I had a winterizing issue were the pump wouldn't suck hard enough to open the one way valve in the winterizing port. I talked to a service guy at the dealer and he told me to turn the filter screen around were you hook hose to, to push the valve open and worked perfect then. then when done turn screen back around so valve closes back up. But that was for the pump to suck fluid in, he told me there have been a lot of issues with theses valves not opening with the pump ,said pump cant open them a lot of times.
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