Not much to explain. I bought several of these for a pair of identical sailboats that I have. It's 16 feet and the kids compete in it. Sailing boats can easily capsize, especially in moderate winds, if children push them vigorously. They don't leak at all and make boats airtight and safe. During assembly I used 3M marine sealant and stainless steel screws from the hardware store. Installation was quick and easy and it looks like they come standard from the factory. Cover plates are of high quality and excellent price. A simple item that just works.
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