Note: After assembly

and industrial ventilators

and the unit extends from the mounting surface by approximately 3-5/8 of an inch once installed

Threads per Inch: 56

Hayward PVC Adjustable Relief Valve, FNPT Inlet Type, FNPT Outlet Type - RV1100T Width-23" Note: After assemblyAdjustable Relief Valve; Body Material: PVC; Inlet Type: FNPT; Outlet Type: FNPT; Inlet Size: 1 in; Outlet Size: 1 in; Factory Set Pressure: 25 psi; Pressure Range: 5 to 75 psi; Disc Material: PVC; Overall Height: 8 3 4 in; Overall Length: 3 1 2 in; Seat Material: FPM; Spring Material: Coated Stainless Steel; Temp. Range: 40 Degrees to 140 Degrees F; Test Lever: No