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Rigid tubing couplers are simple joining fittings that serve to connect the ends of two pieces of equally-sized rigid tubing, functioning like a double-sided push-in fitting. Couplers are normally used when a tubing run is too long to complete with the tubing at hand, or in some difficult-to-reach places where adding a second piece of tube through the use of a coupler is easier than attempting to make a complex bend from a single piece.