One New Aftermarket Replacement Radiator Cap Fits International Harvester (IH) / Fits FARMALL, Oliver, Fits Allis Chalmers, and Fits Massey Harris TractorsThis non-pressurized radiator cap is an original-style replacement featuring the classic "WATER" imprint. It seals on the inside of the radiator fill neck -- please verify your radiator uses an internal-sealing cap before ordering, as some radiators use an external-sealing pressurized cap instead. This cap has no spring and is designed exclusively for non-pressurized cooling systems.Specifications System Type: Non-pressurized Seal Type: Internal (seals on inside of fill neck) Style: with "WATER" imprint Spring: None (non-pressurized design) Compatible ModelsFits International Harvester (IH) / Fits FARMALL: A, AV, B, BN, C, H, HV, I4, I6, I9, M, MD, MDV, MV, O4, O6, Super A, Super A1, Super AV, Super AV1, Super MD, Super MDTA, Super MTA, Super C, Super H, Super M, W4, W6, W9, T6, TD6, T9, TD9Oliver: 60, 66, 70, 77, 88, Super 55, Super 66Fits Allis Chalmers: WC (Unstyled), WF (Unstyled)Fits Massey Harris: Challenger, PacemakerAvery (Minneapolis Moline): AReplaces Part Number(s):43983D, 1B507, B507, 13509G, 206622, 70206622, AT199Aftermarket Interchange NumbersA-43983D, 43983D-A, 1B507-A, 112117New aftermarket replacement part - not remanufactured, not used.