1/2" (5/8" Outer Diameter) CPVC Boiler Drain, Up To 100 PSI At 180 Degrees Fahrenheit, Neoprene Seal Disc, 3/4" Hose Thread Outlet, Hose Threads Complies With ANSI B2.4, Solvent Ends Complies With ASTM D2846, Not For Use With Compressed Air.