Quick Connect Sockets Are Precision Machined - 8 Stainless Steel Ball Bearings - Provides Smooth Action Reliable Service That Resists Plug Deformation When Pressure Spikes Occur - Flow Thru Design & Unrestricted Bore For Free Flow & Minimum Pressure Loss, Push & Snaplock Coupler Convenience Has A Replaceable O-Ring Seal And Can Be Upgraded To Viton To Withstand 300F Deg Hot Water  & Aggressive Chemicals. The Brushed Brass Socket Features A Smooth Action Collar With Easy To Grip Burrelled Rings Rated To 210F Deg.