Caleffi ¾" sweat inlet x ¾" sweat outlet Differential pressure by-pass valve.
Caleffi ¾" NPT inlet x ¾" NPT Outlet Differential pressure by-pass valve.
Caleffi ¾" press x ¾" NPT press Differential pressure by-pass valve.
Caleffi 1" NPT inlet x 1" sweat outlet Differential pressure by-pass valve.
Caleffi 1¼" NPT inlet x 1¼" sweat outlet Differential pressure by-pass valve.
Caleffi 1¼" NPT inlet x 1¼" NPT outlet Differential pressure by-pass valve
Caleffi 1" NPT inlet x 1" NPT outlet Differential pressure by-pass valve.