This is our kit for rebuilding the automatic fuel shutoff for the two cylinder John Deere diesel model cranking engines . We use a correct Viton rubber and diaphragm compound for these kits. All metal components are stainless steel. This particular kit has one filister screw that is longer to fasten the support to the unit. Always take pictures of your assembly before repairs begin. This will provide an accurate reference on re assembly. Make sure all contact surfaces are smooth and sound for proper sealing. Your valve in these assemblies have an undercut at the base of the stem. Make sure to seat your new sealing washer into the groove.