Sup02099 Use with 250 - 700 gph pumps.
1/2" male thread inlet, outlet.

Sup02090 Use with 950 - 1800 gph pumps.
3/4" male thread inlet, outlet

Sup02092 Use with 2400-3600 gph pumps.
1" male thread inlet, outlet. 

Sup02097 1½" male thread inlet, outlet.