Thomas Service Kit. Kit includes 624679 piston cups, 626497 retainers, cylinder sleeves, cylinder orings, head orings, valves, valve keepers, valve restraints, valve screws, head screws, retainer screws. Kit is compatible with standard Thomas 2669, 2689 models (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.)