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The thread is different on the return valve then outlet to the pump. The vacuum will attach the outlet/suction but it is not supposed to work that way. We are going to put in the 1.5” valve on the return this weekend. It fits the 1.5 “ return that came with the sand pump.

I have the same issue with my 15x42 in pool. The new update vacuum won’t screw on the the return. The thread pattern is different. Funny thing, not really, is that the vacuum screws into the intake valve easily. I also upgraded the pump and it included a 1.5” return valve that is have not...