Gerber shower faucets use a ceramic disc-type faucet cartridge that has two inlets with valve seals to operate the hot and cold water flow into the faucet's spout. This setup allows for easier installation and replacement of faulty cartridges. After normal usage, the seals in the cartridge will begin to leak, because they crack and split. This allows water to leak through the handle area. If this is happening to your Gerber faucet, it just takes about a half-hour to replace the cartridge.
Things You'll Need
Turn off your shower water by closing the two water valves in the shower wall, accessible through the access panel behind your shower wall. If you have no access, turn off the home's main water lines near the water heater.
Unscrew the handle from the base of the faucet by locating the screw on the end of the handle, or near the handle base. Unscrew this with an Allen wrench and pull back on the handle to remove it.
Unscrew the retaining nut or bonnet, a small round nut under the handle securing the cartridge to the base, and remove this part. Pull the cartridge out of the faucet to remove it. If the cartridge is stuck, use a pair of pliers to grip the end and pull it back gently.
Slide a new Gerber faucet into the faucet body to replace the old one. Replace the bonnet or dome cap and tighten them to hold the cartridge in place. Install the handle and tighten up the screw to secure this to the cartridge.