When you travel to exotic locations and don't want to be caught without the proper parts to have a malfunctioning Valve fixed, this Sherwood K-Valve Service Kit is what you need. Kit includes all the Components Recommended by the Manufacture and Required to Perform Periodic Maintenance properly on 10 Valves. The K-Valve Kit includes Buna N-Rubber Cylinder to Valve O-Rings, Thick and Thin Teflon Washers, High Pressure Seats, Valve Outlet O-Rings and Copper Crush Washers. So don't get caught without proper parts in your Save-a-Dive Kit to overhaul your Sherwood K-Valve(s).