There are 2 different hose nipples on the back of the Merc 496 Mag Sea Pump (Serpentine Belt Drive), can anybody tell me what those 2 different hose ID's are ?

Thanks

both 1.250,at least that is what 454 and 502 engines use.

Definitely 2 different sizes.

Think the outlet is 1 1/4" and inlet is 1"

I, like a dummy for got to measure the hose ID's when I just rebuilt my Sea Pump, the back plate nipples are 2 different sizes for sure. The large one is 1 1/4" ID, that I'm pretty sure of, it's the smaller one I'm not sure of. I really need to know for sure as I'm installing a Sea Strainer and want to order some new hose up front before I start the install to reduce any down time.

Thank you

Anybody got some sizes for this please ????????????????????????

Yep. The inlet (which is the top nipple) takes a 1 1/4 inch ID hose.

The outlet (bottom nipple) takes a 1 1/2 inch ID hose.

This is correct for a sea pump that has a rear cover that is separate from the pneumatic water dump valve. I am not sure if that still holds for the integrated cover/valve or not.

Thank you very much for posting this up, greatly appreciate it.