Watts 87SI SW 1 1 2 Part of the 87SI Series Strata Systems disc holder disc holder 00 Minimum Temperature Fahrenheit 0 Operating Torque Does Not Apply To Product Outlet Connection Size 4 IN Outlet Connection Type Female Threaded Outlet Thread Type NPT Part Number 0450173 Port Type Full Seat Material Virgin PTFE Series LFB6090 SS Stem Packing Material Virgin PTFE Stem Shaft Material 316 Stainless Steel Stem Type Blowout Proof Thrust Washer Material Virgin PTFE Type Kit Valve Style 2 piece WOG Rating 400 psi UPC 098268601701 a stainless steel retainer cap with PTFE gasket and blow down plug The strainer has a machined seat that allows the screen to be self aligning to assure a perfect fit