This Hose Ferrule should be purchased along with Bulk Hose. This Ferrule is the locking mechanism for the swivel and fixed fittings at both ends of your hose. To properly install, perform the following for each end 1. Slide Bend Restrictor onto hose (39.0377 or 39.0425) 2. Slide the ferrule (24.0462) onto the hose 3. Lubricate the barb of the fitting before installing into the hose 4. Slide ferrule into place on the collar of the fitting and compress to manufacturer's specs. Assembling Hose is not recommended unless your service shop has prior experience and proper equipment to do so. Incorrectly installed fittings can become projectiles if not properly installed.