Black plastic pipe diameter
I use 1-1/4 inch (O.D.), which is typical, I believe. So 1” connectors.
The foot valve would certainly be a first thing to check, especially if you don’t hold the prime if you turn the pump off. Possible it’s in the sand? Unclear what you use to hold it off the bottom. And that pipe can get bent and kinked/cracked by the ice and if it got thrown around this year, that could be the issue — had that happen one year. That could also be the culprit for not holding a prime and maybe restricting the flow. Just a thought.
Black pipe is cheap. Might be easier to put in a temporary line until you can more easily check the existing line when the water’s warmer. Been there....
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