Flapper Exhaust Protector Valve 3 Inch

3 Inch Exhaust Flapper Protective Valve With Stainless Steel Clamp Exhaust protector valve mounts on the outside of 3 in. exhaust tip to prevent backflow of water into the exhaust. For 3 in. diameter exhaust thru hulls Prevents backflow of water into exhaust system Stainless steel clamp included Designed to mount on the outside of exhaust tips Replaces Mercury 34765A1, 34765A2 Replaces OMC/Johnson/Evinrude 509494 Replaces Mallory 9-44000 Does not fit internal style flappers. HOSE CLAMP INCLUDED!