Thomas Service Kit. Kit includes 608212 diaphragm, head oring, foam filter, head screws, valve plate screws, diaphragm hold down plate screw, valves, valve keepers, valve screws. Kit is compatible with standard Thomas 905, 907, 910, 915, 917, 927, 2207, and 2907 models. Two kits are required for each 2207 & 2907 series unit (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.)