The Seachoice 18181 Extra Long Thru-Hull Fitting With Broad Flange is designed for installation in thick transoms or side walls, and for applications where up to 2-1/2 inches of thread are required. Fabricated of molded high-impact plastic that won't rust. Seachoice is committed to delivering quality marine accessories and OEM replacement parts to satisfy fishing, boating and watersports enthusiasts worldwide. Seachoice is run for and by boaters, offering a wide-ranging product line while remaining affordable. Designed for installation in thick transoms or side wallsFor applications where up to 2-1/2 inches of thread are requiredConstructed of molded high-impact plastic that won't rustFits 1-1/8 inch inner diameter (ID) hoseFits hulls up to 3-3/8 inches thickNot recommended for use below the waterlineManufacturer part number 50-18181