Pair of polished stainless steel thru hull exhaust tips fit inboard boats with 4 in. exhaust. 4 in. Angle Cut Transom Exit Exhaust Tips With Flapper | Corsa Performance 11000 90 degree flange exhaust tips Sold as a pair 3 mounting screw holes 6 in. diameter flange Stylish angle cut design For use with 4 in. inside diameter marine exhaust hose Premium 316L stainless steel construction Weighted internal flapper valve to prevent backflow of water into the exhaust system Includes a lifetime warranty internal anti-surge valve (PN# 10900) and all of the mounting hardware Tips measures 11-1/2 in. in overall length with 7-3/8 in. exposed out of the transom