Stuffer tool and rebuild kit (piston, seals, and spacers) for the Fleck 2510, 2700, 2750, and 2900 (upper piston only). This is a genuine Fleck rebuild kit - part# 61670-00 or 61662-01. Piston part number 60090. Seals and spacers part number 60121. Fleck Part# 11098 stuffer tool. Genuine Fleck stuffer tool - part# 11098