If you are noticing that it is getting difficult to fully tighten or loosen the chemical cup housings, it may be time to re-lubricate the mating surface of the cup housings.

To do this, first remove the cup housings and set aside.

Then tip the Pro-Control back so it is sitting on the manifold pistons.

Lightly lubricate the cup housing face seal with food safe lubricant.

Re-install both cup housings.