Easily mounted to the transom, the rubber connector is secured to the outside of the transom by means of a 3/32" thick polished stainless steel mounting ring. Vetus mufflers and goosenecks with corresponding dimensions can be connected directly to the thru-hull. For connection to exhaust hose, a plastic or fiberglass hose-to-hose connector will be required. Made of EDPM rubber Dimension A is the hole cut-out size