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This handy composite device make installing the socket over the cut end of the stainless hose a breeze. Simply open the clamshell, insert the socket, clamp the Koul Tool in a vise, or secure with Vise-Grip pliers. Push the hose through the opening with a twisting motion, and the hard part of hose assembly is done. Three sizes in a box, and they fit all brands of A-N fittings.