O-ring Set Hill Hand Pump MK4

This O-ring set for Hill’s MK4 hand pump contains 3 piston seals. This part gets a lot of friction when you are using the hand pump, so it has to be replaced after a while. Hill provides you with the necessary O-rings in this set to replace the piston seal of your MK4 hand pump when it's needed.

It's a fact that the lifespan of the piston seals gets shortened drastically by not lubricating the pump properly, which causes overheating. Make sure to thoroughly read the manual of that comes with the handpump for correct usage and proper lubrication.