Seals and Spacers Kit for Upper 2900 Assembly but not for older ( before 2005 ) 2900 Fleck Model Valves. This kit comes with 6 spacers, 7 seals and 1 end spacer for newer Fleck 2900s ( upper ). Made to be used with the Piston assembly, 61540, which is also unique for the 2900s ( different than 60090-HF used in older 2900 valves ). Additional Details ------------------------------ Product description: Seals and Spacers Kit for Upper 2900 Assembly but not for older ( before 2005 ) 2900 Fleck Model Valves. This kit comes with 6 spacers, 7 seals and 1 end spacer for newer Fleck 2900s ( upper ). Made to be used with the Piston assembly, 61540, which is also unique for the 2900s ( different than 60090-HF used in older 2900 valves ).