Thomas Major Service Kit. Kit includes C85485-P valve assembly service kit, C87226-P Teflon .63" stroke piston & rod assembly kit, C87860-P ring service kit. Kit is compatible with standard Thomas models GH-3051B, GH-3V1B, GH-3V1B, GH-4VB, GH-505B, GH-517B, GH-610B, LGH-2V, SGH-3V1, SGH-605B, SGH-7102B, TA-2V1, TA-3V2, TA-4051, TA-4101, TA-4V2, TA-5052, TA-6102, and first stage of TA-5172 & GH-517B. Kit content services one cylinder. Depending on type of unit being serviced, you may need one or two kits (This item currently has a tariff surcharge which will be added to your order as a separate line item. Tariff surcharges are subject to change.)