Measure carefully! These unions are used to connect to either 1.5 and 2.0 inch spa pumps with standard union thread. Schedule 40 PVC slip fittings, includes new gaskets.
1.5" PVC union threads measure 2 3/8 to 2 1/2" across the outer diameter of the thread body. 2.0" PVC union threads are 3 to 3 1/16" across the outer diameter of the thread body.
(This union will not fit Hayward pumps).
2 inch part number is 400-5570.