Central vacuum process inlet fittings are intentionally built that has a tighter radius of curvature than those of other bends while in the method. If vacuumed debris becomes trapped it is going to jam with the inlet, the place it is easy to search out and remove. Closet flange[edit] In http://mariofqxek.blogdon.net/details-fiction-and-valves-and-fittings-11849224