Flange, Bolt Hole Size 0.5 in, Compatible Pipe Size 1 1/2 in, Compatible with Brand Bell and Gossett, Compatible with Series LR, NBF, NRF, PL-100, PL-36, PL-55, PR, Series 100, SSF Wet Rotors PL-30, Compatible with Series Family 100, HV, LR, PL, PR,...