Stainless Steel Scupper Valve Barbed - 1-1/2" Hose SizePolish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction:Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistanceAll visible areas are polished to a mirror finish, then passivate each part for additional protectionThick steel sidewalls withstand continual stress and hose flexingFaster, Simpler Installation:Each Scupper Valve is available with a new silicone gasketA channel under the flange holds a bead of sealant, making it easier to apply a trouble-free sealAll models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hullThe barbed tail ends provide plenty of room to hold multiple clampsStainless Steel Scupper Valves, Barbed:The Scupper Flap is tough neoprene rubber with a molded V that fits into the grooved body to reduce backwashFasteners are concealed and corrosion-proofSpecifications:Hose size: (inch) 1-1/2" inner diameterThread Diameter: (inch) 1-7/8" Flange O.D. (outside diameter): (inch) 3"Thread Length: (inch) 3-1/2"Barb Length: (inch) 1-1/2"Total Length: (inch) 5-1/2"Install Hole Saw Size: (inch) 2" Thread NPSM: (inch) 1-1/2"Max Hull Thickness: (inch) 3"*Stainless Steel Thru-Hull Connectors are designed for installation above the water line only