Figure 6-14. Cartridge valve, 3-way.
d. Loosen the set screw that secures the valve in the block. The set screws are
on the bottom of the master block.
e. Pull the cartridge valve out of the master block. If the valve can not be pulled
out by hand, use pliers on the toggle or stem.
f. Lightly coat the replacement valve O-rings with silicone lubricant, then push
the replacement valve in until it is fully seated. For toggle valves, be sure that the
ON/OFF position is properly oriented. Firmly tighten the set screw.
g. Reinstall the block assembly to the faceplate, then turn the air on at the floor