A great way to reduce risk of backflow in 3in. and 4 in. exhaust systems.
Exhaust flappers are an effective way to protect the engine from water that surges back into the exhaust system. Centek thru-hull flappers are constructed of a compression molded fiberglass to eliminate corrosion issues and feature a 7/8″ wide flange to provide more than adequate bedding surface for installations close to the waterline. A weighted rubber flap allows exhaust and cooling water to escape freely and closes off to the back-flow of sea water. The combination of rubber flap and fiberglass thru-hull makes operation silent. Available for 3″ and 4″ exhaust systems.
Key Features
- Fiberglass thru-hull construction is non-corrosive
- Weighted rubber flaps repel back flow surges caused by waves, following seas or backing down
- Wide mounting flange provides extra surface for bedding material; ideal for installations close to the waterline
- Class 1 fire retardant resin to stand up to heat and prevent the spread of fire
- Available for 3″ and 4″ exhaust systems
- Replacement flap kits are available
Specifications
- Hose Size: 3″, 4″
- Dimensions 3″: 4 7/8″ dia flange (3″ hose) x 5 1/2″L (3″ from flange inboard)
- Dimensions 4″: 5″ dia flange (4″ hose) x 7 3/4″L (4 1/2″ from flange inboard)
- Approvals: ISO 9001:2008, Lloyd’s Register, ANAB, UL94V-0 flame retardancy
Data Sheet 3″
Data Sheet 4″





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