ITEM NAME:1Pcs 1Inch White Plastic Thru-Hull Bilge Pump Aerator Hose Fitting for Bo XCS.Their construction is designed to resist degradation as a result of chemical and saltwater exposure. 1PCS Plastic Thru-Hull Hose Fitting. 1 Pcs Plastic Thru-Hull Hose Fitting. This fitting should be used above the waterline.