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I notice that a number of check valves used in basement sump installations are 1.5" valves with 1.5" to 2" unions/couplings on either end. Any reason to not go with a 2" check valve instead? Thanks.

Good point. I had switches go bad on two Zoeller M53s and I think it was just due to the contacts wearing and arcing, not water contamination.

I see this topic has been discussed some years ago but I’d like to get a fresh perspective on it. After losing a second submersible pump from a reputable manufacturer due to a faulty switch, it’s obvious that an otherwise reliable design has a known Achilles heel. Yes, I understand the switch...

Looks like it was the check valve. I couldn't blow through it but once it had an 8' column of water above it, the water would drain back into the sump. Looks like Zoeller has a history of known issues wit their switch design and hasn't done anything with as far as a redesign, etc. I'm going...

I have a Zoeller model 53 pump in a basin approximately 24" deep and 24" in diameter. The pump sends water up out of the basin to an 8' vertical x 2" diameter schedule 4o PVC pipe and out the house. I've had this setup for over 15 years and am on the second pump after the contacts burned out...