2-Way Piping Package Assembly. Control valve is Pressure Independent Control Valve Normally Closed, size 1.25", flow is preset to 13 GPM, with 24 Vac Electronic SSD61U Actuator, Modulating Non-Spring Return. The supply side has Y-Strainer with Drain and PT plug, size 1.25"FPNT. The return side has Manual Air Vent, PICV, Isolation Valve. The Air Vent and Isolation Valves are sized at 1.25"FPNT. A pair of 24" MNPT hoses are included in the assembly. Assembly is delivery zip-tied.