The Forespar® outboard motor well drain offers a corrosion proof, easy-to-install replacement for the old fashioned buttress fitting. Can also be used as as a chafe guard to lead hose, wiring, steering cables, etc. through bulkheads, floor timbers and fiberglass panels. Barbs on O.D. ensure positive locking action. Designed to fit 1" (25.14mm) diameter hole. Flange is 1-1/4" (31.75mm) diameter. Usable length is 2-1/2" (63.5mm).