Thomas Service Kit. Kit includes Cylinder sleeves, cylinder orings, connector tube orings, 624384 piston cups, head screws, head orings, retainer screws, valves, valve keepers, valve restraints, valve screws. Kit is compatible with standard Thomas 2770 models. A (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.)