Delta Shower Faucet Dripping? The 20-Minute Fix and the Exact Cartridge You Need

A Delta single-handle shower that drips after you shut it off is one of the most common bathroom repairs in any American home, and one of the easiest to fix yourself. The steady drip you hear is not a sign that the whole valve is failing or that you need to open the wall. In almost every case it is one small worn part inside the valve: the pressure-balance cartridge. Swap it, and the drip stops.

This guide walks through why a Delta single-handle shower drips, how to figure out exactly which Delta cartridge is behind your wall (this is the step most people get wrong), and how to replace it in about 20 minutes with basic hand tools. No tile work, no soldering, no plumber.

Why Your Delta Shower Drips

Delta single-handle tub and shower valves use a pressure-balance cartridge. That cartridge does two jobs at once: it mixes hot and cold to set your temperature, and it holds water back when the handle is off. Inside the cartridge are rubber O-rings and small seals that press against seats to create a watertight shut-off.

Over years of use those seals harden, crack, and wear. Mineral deposits from hard water build up on the moving parts and chew at the rubber. Once the seal can no longer close completely, water sneaks past it and you get the classic symptoms: a drip from the showerhead or tub spout after you turn the handle off, a handle that feels stiff or gritty, water that will not get hot enough or swings temperature when someone flushes a toilet, or a valve that will not fully shut off no matter how hard you crank it.

Tightening the handle does not fix any of this, because the problem is inside the cartridge, not at the handle. The repair is to replace the cartridge with a fresh one. Here is what that looks like before and after.

Figure 1 · Before and AfterA worn Delta cartridge drips from the spout and weeps behind the trim. A fresh pressure-balance cartridge restores a clean shut-off and steady temperature, without opening the wall.

Watch the Fix First

If you want to see the repair before you start, here is the short version. The full step-by-step is further down the page.

The Step Everyone Gets Wrong: Which Delta Cartridge Do You Have?

This is where most people waste a trip to the store or order the wrong part online. Delta has used several different single-handle cartridges over the decades, and they look similar in a photo but are not interchangeable. Buy the wrong one and it simply will not seat in your valve. Before you order anything, you need to identify which cartridge is actually in your wall.

The single most reliable tell is the cap color on the cartridge once you pull it, and the year your valve was made. Here is the rule Delta itself uses on its install sheets:

If the cap on the cartridge is grey, you have a 13/14 Series MultiChoice cartridge: the RP46074, used in valves made after March 2006. If the cap is white, you have a 1300/1400 Series Monitor cartridge: the RP19804, used in valves made from 1993 to 2006. The two are not interchangeable.

So the safest approach is always the same: shut off the water, pull the handle and trim, and remove the old cartridge first. Look at the cap color and match it. If you are replacing a drip on a valve installed in the last fifteen years or so, it is almost certainly the grey-cap RP46074. If your home or that bathroom was last remodeled before 2006, it may well be the white-cap RP19804 instead.

The chart below covers the four Delta single-handle cartridges you are most likely to run into, with the symptom that points to each one.

Figure 2 · Delta Cartridge IdentificationThe four most common Delta single-handle cartridges. Pull yours and match the cap color and body shape. RP46074 (grey cap) is the 13/14 Series for valves made after March 2006. RP19804 (white cap) is the 1300/1400 Series for pre-2006 valves.

A quick way to narrow it before you even open the wall:

• One handle that both turns on the water and sets temperature, valve from after 2006: RP46074 (13/14 Series). This is the most common by far and the one this guide focuses on.
• One handle, same single-function design, valve from 1993 to 2006: RP19804 (1300/1400 Series Monitor). We carry this as a separate FourHome listing.
• A handle for volume plus a separate dial or sleeve for temperature: that is a 17 Series (RP46463) or 17T TempAssure (RP47201), a different family entirely. Those are not covered here.

If you are still unsure, run the FourHome Stem and Cartridge Finder for a three-click visual match, or pull the old cartridge and measure it before ordering. For a full cross-brand walkthrough, see our faucet cartridge identification guide.

How the Delta Single-Handle Valve Works

It helps to understand what is happening behind the trim plate before you take it apart. In a Delta single-handle tub and shower valve, hot water enters from one side and cold from the other. The cartridge mixes them and routes the blended water either up to the showerhead or down to the tub spout, depending on your diverter. The pressure-balance mechanism inside the cartridge keeps your set temperature steady even when someone else in the house runs water, which is what protects you from a sudden scald or cold shock.

Figure 3 · Delta 1-Handle Valve LayoutHot and cold enter the sides of the valve, the cartridge mixes them, and the blended water is routed up to the showerhead or down to the tub spout.

What You Will Need

This is a short tool list. Most of it is already in a basic homeowner kit.

• The correct replacement cartridge (RP46074 for post-2006 13/14 Series, identified above)
• A hex key (Allen wrench) for the handle set screw
• Adjustable pliers or channel-locks
• A Phillips screwdriver
• Silicone plumber's grease (included with the FourHome cartridge)
• A towel to cover the drain so nothing falls down it

How to Replace the Cartridge in 5 Steps

Plan on about 20 minutes. The only step people rush is the limit stop in step three and step five, so read those twice.

Figure 4 · Easy DIY Install in MinutesThe full sequence at a glance. Shut off and bleed, remove the handle and trim, pull the old cartridge, seat the new one with the O-rings greased, then reassemble and test.

The Mistakes That Cause Callbacks

These are the errors that send people back to the store or leave the drip in place. Avoid them and this is a one-and-done repair.

Dimensions and Specs

For the post-2006 13/14 Series valve, here is the FourHome replacement cartridge at a glance.

Figure 5 · Dimensions and FeaturesPressure-balance protection, an adjustable scald limit stop, and a Type P verified fit, machined to the original dimensional specification.

What Else This Cartridge Fits

The RP46074 cartridge is used across a wide range of Delta MultiChoice 13 and 14 Series single-handle tub and shower trims. If your trim is one of these collections, this is your part.

Figure 6 · Compatible Valves and CartridgesFits MultiChoice rough-in bodies R10000, R11000, R18000, and R22000, and 13/14 Series trim collections including Classic, Foundations, Lahara, Linden, Cassidy, Trinsic, and more.

How Long, How Much, and Do You Need a Plumber?

This is a do-it-yourself repair. You do not need a plumber for a dripping single-handle Delta shower. The job takes about 20 minutes with the hand tools listed above, and the only real cost is the cartridge itself, typically 20 to 40 dollars. A plumber service call for the exact same swap usually runs 150 to 350 dollars, almost all of it labor. If you can use a hex key and a pair of pliers, you can do this.

The repair also pays for itself fast in another way: a shower that drips even slowly wastes hundreds of gallons a month, and a drip that runs hot is wasting heated water on top of it. Stopping the drip stops both.

Why FourHome

Our replacement for the Delta RP46074 is built to the original dimensional specification: solid brass stem, the same body diameter, the same Type P fit, with the adjustable scald limit stop and a full set of O-rings and seals included. It comes from the same kind of factory that produces OEM cartridges for the major plumbing brands, so you get the fit and the material quality without the brand markup.

Figure 7 · Quality MattersSolid brass construction, anti-scald protection, and proper fit tolerance, versus the low-grade plastic and loose tolerances that cause repeat leaks.

Have a pre-2006 white-cap valve instead? You need the FourHome replacement for Delta RP19804 (1300/1400 Series Monitor). Still not sure which one you have? Run the Stem and Cartridge Finder for a three-click visual match against every cartridge in the FourHome catalog.

One Cartridge, Every Setting

The same RP46074 replacement that fixes a drip in your home shower is the part that keeps showers running in hotels, apartment buildings, schools, and hospitals. Delta single-handle valves are everywhere, which is exactly why having the right cartridge on hand matters whether you are fixing one bathroom or managing a hundred units.

Figure 8 · For Use in Every SettingHospitality, institutional, multifamily, and residential. The same cartridge, the same 20-minute fix.

Managing a portfolio of units? Volume pricing on this and the rest of the FourHome catalog is available for contractors and property managers through FourHome Pro. For the cost math on stocking repair parts across a multifamily property, see our property manager's guide to bulk plumbing parts.