Sea Dog Exhaust Thru Hull, Stainless flap with rubber seal, Four mounting studs are 2-1/4" long, for a maximum transom thickness of approximately 1-3/4". The Exhaust Thru-Hull features a stainless flap with a rubber seal. Designed for use with 2-1/2" hose. Constructed of corrosion resistant investment cast 316 stainless steel. Includes mounting plate and fasteners.

Flange diameter: 4-1/2"
Flange depth: 7/8"
Overall length: 5-7/8"