ITEM NAME:3/4" Inch Black Plastic Thru-Hull Bilge Pump and Aerator Hose Fitting Boats Description: 20mm diameter Straight Nylon Plastic Thru Hull Bilge Fitting High quality nylon material, UV stabilized construction. Molded black plastic with stainless steel edge It is not recommended to use under the water line Widely applications ï ¼Å¡ Boats Yachts Caravans trucks Autocaravans Tractor And many more ... kitchen or grill area. Each.1x Plastic Thru Hull Bilge. Widely applications ï ¼Å¡ Boats Yachts Caravans trucks Autocaravans Tractor And many more. kitchen or grill area. Molded black plastic with stainless steel edge. Total : 86mm.