SEAL KIT - 3" CYLINDERS OLD STYLE (SK400504) Waratah Part #F350604 Fits Waratah Models HTH620, HTH622, HTH622B, HTH624 Fits older Delimb, Drive & Tilt cylinders. Best way to identify is older cylinders have a large nut underneath the piston. Fits: 620 & 622 Tilt, Delimb, & Feed Arm Cylinders Fits:622B Tilt, Delimb, Feed Arm Cylinders (Serial up to 367) Fits: 624 Tilt, Delimb, Feed Arm Cylinders (Serial up to 357)