What makes the XRP Swivel Hose Ends and Swivel adapters so reliable? Two O-Rings and a piloting feature to prevent side unloading of the O-Rings. We get compliments all the time on the quality of the design and performance long term. There is a definite difference. Redundancy is a factor in areas where O-Rings are not serviceable for replacement and many have complained about the single O-Ring swivels leaking and dripping Swivel Hose Ends for HS79 are now available as well as Crimp