Matt, thanks for the reply! Apparently the 1262 is similar cuz your insructions make sense :grin: ... I think I follow, but have a few questions.

Output side: The outside threads on the output are an odd size (metric pipe thread?) and a 3/4" PVC female thread "catches" only about the bottom third of the threads, but does get nice & tight. Is this what you experienced, and did it result in a good water tight seal? Maybe lots of teflon tape for good measure, and maybe a dab of PVC glue where the PVC coupler contacts the top of the barb "housing"?

Input side: this "Barb" fitting also contains an "O" ring, but a 3/4" MPT PVC snugs up tight against the pump "Cap" (Threads don't bottom out!). Again, with tape were you able to achive a water tight fitting.

Thanks for the help - Steve!