CENTEK Exhaust Parts Thru Hull Exhaust Flappers – W/Flapper, Black

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″