These are two seal packs for the John Deere diesel two cylinders using Scintilla Injector Pumps. Each pump uses one seal. John Deere currently produces this seal in brass. Brass is harder than the copper and during the assembly process may crack. When this happens, fuel leaks as it is pressurized and the work must be repeated. Our copper seals are more malleable and will seal without failure. These are accurately machined with the correct bevel for proper fit.