JT-HLM Boat Stainless Steel Trim Cover 1-1/2 Inch Straight Hose Pipe Elbow Bilge Pump Drain Thru Hull Fitting Product features： This Black Nylon 1-1/2" thru-hulls gives the look of stainless steel , but are for above-the-waterline use only. Uses include scupper, sink drain and bilge pump overboard discharge. Made of durable polypropylene to withstand the rigors of marine environments,stainless-steel flange provides excellent corrosion resistance,Ideal for use as an exhaust port for a bilge pump. Easy and quick for installation, sturdy and well made.(Not recommended for use below the waterline) Product description: Material: Nylon & Stainless Steel (Thru-Hull Fittings Cosmetic upgrade to nylon thru-hull) Color: Black Size:Hose1- 1/2 inch(38.1mm) Package Includes: 1x Thru-Hulls Note: Please allow 1-3mm/0.04"-0.12" error due to manual measurement. Thanks for your understanding.