This maintenance kit is for 1.5” standard cylinders manufactured between 2004 and 2013. These have screw-in style piston check valves that we no longer produce. Therefore, these items are not included in the maintenance kit. If the screw-in style check valve needs replaced, then a current version of the piston assembly would have to be purchased. This cylinder also uses a separate foot valve which is included with the maintenance kit.
With this kit you will be able to replace most wear items and some hardware to keep your Bison Pump Cylinder running strong!
Bison Pumps offers an upgrade kit that would convert most cylinders to the latest model. For more details visit Cylinder Upgrade Kits.