How to Fix a Leaking Shower Faucet: Single-Handle Cartridge and Two-Handle Repair

Frequently Asked Questions

How do I fix a single-handle shower faucet that keeps dripping?

A dripping single-handle shower faucet almost always has a worn cartridge. Turn off the water supply, remove the handle and trim plate, pull the old cartridge out with a cartridge puller tool, and insert a matching replacement cartridge in the correct orientation. Moen and Delta cartridges are brand-specific — use the model number on the cartridge or faucet to get an exact match.

Do I need to turn off the main water supply to fix a shower faucet?

Not always. Many shower valves have integral shutoffs behind the wall, accessible through an access panel in the adjacent room or closet. If there is no access panel and no local shutoff, you will need to turn off the main house supply. Check for an access panel before assuming you need the main.

How do I fix a two-handle shower faucet that leaks?

Two-handle shower faucets use compression valves. The leak comes from a worn seat washer at the bottom of the stem. Turn off the water, remove the handle and packing nut, unscrew the stem, replace the rubber seat washer at the tip, and reassemble. If the leak continues, the brass valve seat inside the faucet body may also be pitted and need resurfacing or replacement.

How do I find the right replacement cartridge for my shower faucet?

Pull the old cartridge out and bring it to a plumbing supply store for matching, or look for a part number stamped on the cartridge body. Moen cartridges are labeled 1225, 1222, or 1200 series. Delta uses a ball assembly or ceramic disc cartridge depending on the model. If you know the faucet brand and series, search the manufacturer's website for the correct cartridge part number.

What causes a shower faucet to drip only when turned off?

When the faucet is off and water still drips from the showerhead, the valve inside is not sealing completely. In a cartridge faucet, the cartridge seals are worn or the cartridge is installed backwards. In a compression faucet, the seat washer is compressed flat and no longer seals against the valve seat. Either way, the internal sealing surface needs replacement.

Is a leaking shower faucet worth fixing or should I replace the whole valve?

In most cases, a cartridge or seat washer replacement is worth doing — parts cost $10-$40, and the fix lasts 5-15 years. Replace the whole valve body only if the valve body itself is cracked, corroded, or is a discontinued model with no available parts. Replacing a valve body requires cutting into the wall and is a job for a licensed plumber.

A shower faucet that drips from the showerhead after being turned off has a worn cartridge, seat washer, or O-ring inside the valve. Single-handle cartridge faucets need the cartridge pulled and replaced — typically a 30-60 minute job.

A shower faucet that drips after you turn it off is wasting water and money every single day. A single slow drip from a showerhead can waste over 1,000 gallons a year. The fix is almost always a worn internal part — a cartridge, seat washer, or O-ring — that costs $10-$40 and takes an hour to replace.

The key is identifying which type of faucet you have before buying anything. The repair is completely different depending on faucet type.

Identify Your Faucet Brand and Type

Before you buy a single part, identify what you have.

Single-handle cartridge faucets are the most common modern shower valve. One handle controls both temperature and flow. Brands: Moen, Delta (some models), Kohler, Price Pfister. The internal part is a plastic or ceramic cartridge that slides in and out of the valve body.

Single-handle ball faucets use a rotating ball with inlet ports. Less common in showers than in kitchen faucets. Brand: Delta (older models). Repair involves a ball, springs, and seats kit.

Two-handle compression faucets have separate hot and cold handles. Older construction — pre-1990s in most homes. Inside each handle is a threaded stem with a rubber seat washer at the tip. These drip because the washer wears flat.

Thermostatic valves (Moen Posi-Temp, Kohler Rite-Temp) have a single handle but use a thermostatic cartridge rather than a standard pressure-balance cartridge. Replacement cartridges are brand-specific and cost $30-$80.

Look for a brand name on the faucet handle or trim plate. If you can’t find it, the cartridge itself usually has the brand stamped on it once you pull it out.

Turn Off the Water at the Shower Valve or Main

Check for an access panel first. Many shower valves have a panel on the opposite side of the wall — in a closet, hallway, or adjacent room. Open it and look for a shutoff valve on the hot and cold supply lines running to the shower. If you find one, turn both off.

If there is no access panel and no local shutoff, turn off the main house water supply. The main shutoff is usually at the water meter near the street, or at the point where the supply line enters the house.

After shutting off water, open the shower valve to relieve pressure and drain any water in the lines.

Single-Handle Cartridge Replacement

What you need:

• Replacement cartridge (Moen 1225, Delta, or brand-specific)
• Cartridge puller tool
• Plumber’s silicone grease
• Phillips and flathead screwdrivers
• Adjustable pliers
• Needle-nose pliers

Step 1: Remove the handle. Look for a decorative cap on the front of the handle — pry it off with a flathead screwdriver to expose the screw underneath. Remove the screw and pull the handle straight off. Some handles have a setscrew on the side; use an Allen key.

Step 2: Remove the trim plate and retaining clip. The trim plate (escutcheon) usually pulls off or unscrews. Once removed, you will see the valve body. Look for a small U-shaped retaining clip holding the cartridge in place at the top or side of the valve. Use needle-nose pliers to pull the clip straight out and set it aside — you will reuse it.

Step 3: Pull the cartridge. This is where the cartridge puller tool earns its keep. Thread or hook the puller onto the cartridge stem and pull straight out. Do not twist — twisting can break the cartridge or damage the valve body. If the cartridge is stuck, wiggle gently while pulling. Bring the old cartridge with you to match the replacement.

Step 4: Note the orientation. Before inserting the new cartridge, look at how the old one came out. On Moen cartridges, the ears on the sides of the cartridge must line up with the slots in the valve body, and the cartridge must face the correct direction. Installing it 180 degrees off will reverse your hot and cold.

Step 5: Lubricate and insert the new cartridge. Apply a thin coat of plumber’s silicone grease to the O-rings on the new cartridge. Slide it straight into the valve body until fully seated. Reinstall the retaining clip.

Step 6: Reinstall trim and test. Replace the trim plate and handle. Turn the water back on slowly. Test: turn the shower on, then off, and watch the showerhead for 60 seconds. No drip means a successful repair.

If a Moen cartridge drips after install and the hot and cold are swapped, shut the water off, pull the cartridge, rotate it 180 degrees, and reinstall.

Two-Handle Compression Faucet Repair

What you need:

• Seat washer repair kit
• Adjustable wrench
• Screwdrivers
• Seat wrench (if valve seat is damaged)

Step 1: Identify which handle leaks. Turn the shower water off, then open only the hot handle. If the drip increases, the hot side seat washer is the problem. Repeat with the cold side.

Step 2: Remove the handle. Pop the decorative cap, remove the screw, pull the handle off. Behind it is a packing nut — the large hex nut that holds the stem in the valve body.

Step 3: Unscrew the packing nut. Use an adjustable wrench to turn the packing nut counterclockwise. Remove it, then unscrew the stem by turning it counterclockwise as if you are opening the faucet.

Step 4: Replace the seat washer. At the very bottom tip of the stem, a rubber washer is held by a brass screw. Unscrew it, replace the washer with one from your repair kit that matches the size and shape, and reinstall the screw firmly.

Step 5: Inspect the valve seat. Shine a flashlight into the valve body opening. The brass seat at the bottom should be smooth and flat. If you see pitting, scoring, or corrosion, the seat must be resurfaced with a seat grinder or replaced with a seat wrench and replacement seat. A pitted seat will wear through new washers quickly.

Step 6: Reassemble and test. Screw the stem back in, reinstall the packing nut (snug, not overtightened), replace the handle. Turn the water on and test.

Replacement Trim if the Valve Body Is Fine

If the valve body is good but the trim looks worn or dated, a replacement trim kit can refresh the whole look without touching the plumbing. Match the trim to your existing valve series.

When to Call a Plumber

Inaccessible valve body. If the valve is sweated (soldered) into copper pipe with no shutoff access, opening the wall and cutting pipe is required. That is plumber work.

Corroded valve body. If the brass valve body itself is pitting or cracked, the entire valve must be replaced — a full rough-in job.

Leak at the wall. Water dripping at the wall behind the faucet, not from the showerhead, signals a supply line connection failure — not a cartridge issue.

Thermostatic valve failure. If the shower temperature is erratic or the anti-scald mechanism is not working correctly, the thermostatic cartridge must be replaced. Some are DIY-accessible; others require disassembly of the entire valve.

Related Reading

• How to Fix a Dripping Shower Head
• How to Replace a Shower Head
• How to Fix a Leaky Shower Valve
• How to Fix a Leaky Shower