This is an easily fitted flexible rubber machine cuff for attaching hose to machinery. One end has a moulded thread that screws directly onto our 100mm clear hose, the other end of the cuff is a snug fit onto a 102-110mm diameter machine extraction port. Turn the cuff inside out if it does not match your hose spiral. It makes for an easy connection, and re-connecting the extractor from one to machine to another as simple as possible.