These John Deere LP-Shut off valves are for the Liquid and Vapor fittings on the LP Tank.  They are hand operated and act as the main shut off valves for the tractor. Some folks refer to these as tank dash valves. These valves are exact replacement of original John Deere valves, except ours includes an internal check valve which prevents tank venting if a valve were to fail. Valves come complete with original John Deere styled handle. For John Deere Tractors 50LP through 2010LP (New-Gen) and 45-95 Combine.  Replaces John Deere Parts A4999R and  AA6005R.