This is a A-3901517M1 Expansion Valve (block type) PN: 3901517M1Main Description As Following : A-3901517M1 Expansion Valve (block type) P.N: 3901517M1 A-3901517M1 Expansion Valve (block type) P.N: 3901517M1 Stocked As: A-904-617 Found in Section & Models : Air Conditioning Parts > Expansion Valve, Allis-Chalmers TRACTOR: 8745, Allis-Chalmers TRACTOR: 8765, Massey Ferguson TRACTOR: 4225 (S/N