I don't think you are referring to the same unit as I have. I have a
Raritan PHII.
At any rate I fixed it this afternoon. The ball, part 1201, was stuck down at the bottom of the inlet valve on the intake cylinder which is on the front side of the
pump housing. I guess the pressure of the spring on it all
winter had made it stick.
The question now is how I prevent that happening again next winter ?
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