Review on Sierra 18 4456 Exhaust Protector Valve by Dan Phillips

Great product so far! Our two-man boat with 4 exhaust pipes became a bird house on the boat lift. Placing these flaps over the exhaust pipes has previously kept birds out and also helps keep water out when reversing. They're a little pricey for a simple concept, but other than that I love them! Let's see how long they last! The only suggestion I would make to the manufacturer is to reinforce the rubber compound on the valve as it is flimsy and can wear out and crack after a few years of use in the sun. .