Patriot Docks Vinyl Pipe Cap The vinyl pipe caps fit 1-12 schedule 40 pipe and measures 1.875 diameter. For aesthetics only. Patriot Dock components are modular to make it easy to customize the size and configuration for maximum versatility. We have prepared many dock packages which can be combined to almost any layout. Your dealer can put together the plan that works best for you. Check out some sample packages below. You can add more sections or combine packages to make just about any configur