This is a NEW Stanadyne pencil injector for the John Deere 6420 tractor. It is not a will fit or reman with eroded holes which lead to poor engine performance and excessive fuel consumption. Stanadyne is the OE supplier of this injector to John Deere. The John Deere P/N's for this injector are RE531436, SE501103, or SE500830. This injector is used in the 4045HL270/271 engine.