Leather piston cup seals 1 inch (25.4 mm) outside diameter. This is a standard Leather cup seal. Leather naturally varies in thickness, however, these seals are made to very close tolerances. They will expand a little to fit an out of round or over sized compression tube or can be reduced in diameter with sand paper and made to fit a slightly undersized compression cylinder. Therefore, you can use them to replace 25 and 26 mm piston seals. You might need to purchase H0851016800 to accompany this seal. Fits CRS3100, Gamo 300 , Daisy 120, 130, and 131, 220, Diana 25, 27, Haenel 300, 302, 303, 304, etc., Milbro 25, and others
