MODEL NO. PORT SIZE BY-PASS INDICATOR PORTS POST SIZE FLOW OPTIONS 2005411A 1-1/2" NPT 25 PSI Inlet 2-1/8" NPT 1-1/2" - 16 Code A 2005311A 1-1/2" NPT 15 PSI Inlet 2-1/8" NPT 1-1/2" - 16 Code A 2005411C 1-1/2" NPT 25 PSI Inlet 2-1/8" NPT 1-1/2" - 16 Code C 2005311C 1-1/2" NPT 15 PSI Inlet 2-1/8" NPT 1-1/2" - 16 Code C 2022411A SAE-24 25 PSI Inlet 2-1/8" NPT 1-1/2" - 16 Code A 2022311C SAE-24 15 PSI Inlet 2-1/8" NPT 1-1/2" - 16 Code C