PVC Schedule 80 pressure fitting. Used to join lengths of pipe. (F.I.P. x F.I.P.) No. 301558: Type: Slip, Size: 1/2" FIP, Material: PVC, Schedule: Schedule 80 No. 301578: Type: Slip, Size: 3/4" FIP, Material: PVC, Schedule: Schedule 80 No. 301588: Type: S