Symptoms
- Water trickles from around the handle escutcheon plate while running
- No leak when the shower is off
- Wall or trim plate feels wet during use
- Leak worsens with higher water pressure
Likely causes
- CommonWorn O-ring or seal on the cartridge stemThe seal where the stem passes through the valve body wears down and allows water to seep past under pressure.
- PossibleCracked or loose escutcheon plate sealThe trim plate itself may have a foam or rubber gasket that has degraded.
- PossibleCartridge not fully seated or securedIf the retaining clip or nut wasn't tightened correctly during a previous repair, water can bypass the seal.
- Less commonCracked valve bodyA physically damaged valve body is uncommon but possible in older or freeze-damaged plumbing.
What to do
- Turn off the water supply to the shower before disassembling anything.
- Remove the handle and trim plate to expose the cartridge and valve body.
- Inspect the O-rings around the cartridge stem for visible wear, flattening, or cracking.
- Replace the O-rings with an exact match, lightly greasing them with plumber's grease before reinstalling.
- Confirm the cartridge is fully seated and the retaining clip or nut is snug, not just finger-tight.
- Reinstall the trim plate, making sure its gasket is intact and correctly positioned.
- Turn water back on and run the shower for a few minutes, watching the base of the handle closely for any seepage.
Tools and parts
- Screwdriver
- Adjustable wrench
- Plumber's grease
O-ring kit for shower valveSearch: “shower faucet O-ring replacement kit”
When to call a pro
Call a plumber if the valve body itself appears cracked or the leak continues after replacing seals.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.