This item is an authentic OEM sourced O-ring kit that replaces worn or damaged O-rings for the gun, hose and wand.Unfortunately, over time o-rings will wear out and they may begin to crack eventually requiring replacements. Refer to the appropriate diagrams for your model to ensure the correct replacement procedure. A screwdriver and a wr...Read moreench set might be needed to take apart and reassemble the equipment. Note, this kit is sold as an individual item.