Aqua-Flo 1.5"MPT X 1.5"S Pump Union Assembly 58304000 Plumbing Connection Size "A" 1-1/2 Plumbing Connection Type "A" Male Pipe Thread (mpt), Slip (s) Plumbing Connection Size "B" 1-1/2" Plumbing Connection Type "B" Male Pipe Thread (mpt), Slip (s)