Gen3 Marine Plastic 1 Thru-Hull Fitting The Gen3 Marine Thru-Hull Fitting is constructed of durable plastic and has a straight thread. The trim cover is made of mirror-polished stainless steel instantly upgrades any vessel with a clean look and tong-term corrosion resistance. Specifications Total Fitting Length 3 Thread length 1.75 Hose ID 1 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Thru Hulls Product MPN 5-1111 Product UPC 8