SEAL KIT - MEASURING & 3/4" SAW CYLINDER OLD STYLE (SK320503) Waratah Part #F350603 Fits Waratah Models HTH620, HTH622, HTH622B, HTH624, HTH626 Fits older style Measuring Cylinder and Main Saw 3/4" Cylinder. To identify if you have old style or new style, the old style has a large nut at the base of the piston. The new style has an allen head bolt. Fits: 620 Measuring Cylinder & 3/4" Saw (if equipped) Fits: 622 Measuring Cylinder & 3/4" Saw (if equipped) Fits: 622B Measuring Cylinder & 3/4" Saw (if equipped) Fits: 624 Measuring Cylinder & 3/4" Saw Fits: 626 Measuring Cylinder & 3/4" Saw