Thetford 94160 RV Sewer Hose 4″ Plastic Bumper Plug w/ TabsThis bumper plug is designed to seal off the end of a 4-inch square bumper on an RV. The bumper typically serves as storage compartment for sewer hoses, fishing rods, or other elongated items. The plug is designed to prevent the contents from falling out during transit, as well as to keep out debris. Made out of durable UV stable black plastic for a secure fit.Two Tabs: Designed with two tabs that fit pre-cut slots on the walls of the bumper.Plastic: Made from fade-resistant black plastic.Compatibility: Fits 4″ hollow square bumpers with pre-cut slots for the plug tabs.