The Original Proper Hub Cap is a patented protective vinyl cover which is installed over the propeller hub to prevent water and moisture from entering the propeller hub exhaust cavity during out of water storage, it is also used during in water storage to prevent the build up of Zebra and Quagga mussels on internal drive components PROPER HUB CAP FOR PROP BOAT STORAGE - MADE IN USA NIP Proper hub cap for proper boat storage. Package has three sizes included 4", 4 -1/2" and 4 -3/4"- select the size of cap that fits your propeller best. It should be slightly smaller than the hub of your propeller so that is will stretch over the hub and fit tightly. Proper hub fits all popular models of powerboats - inboard/outboard and outboard - three sizes of caps included, will fit both factory and aftermarket propellers including progressive propellers - simple installation and removal - Moister and water are extremely dangerous to your drive unit and motor during storage - moisture travels back and forth through your propeller hub into your motor during storage as temperatures change - this causes corrosion to your internal engine components - this happens even if you keep your boat indoors. Water freezing in your lower drive unit will cause it to crack - Proper Hub Cap creates a barrier to stop this. FOR PETE'S SAKE PUT SOME PROTECTION ON IT!!
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