They are designed to go with the Drennan In-Line Flat Method Feeders and Pellet Feeders but they are also suitable for lots of other uses where a quick change connection is required. They provide an easy loop-to-loop, slimline join which locates neatly back inside the body of an inline feeder. The rubber sleeve semi locks into a central position for security and the internal moulding has a breaking strain of approximately 36lb (16kg), making it an extra-strong connection method.