That dripping sound coming from your shower head or tub spout isn’t going away on its own. You know the one — that steady drip, drip, drip that you can hear from the other room. Most homeowners assume the showerhead is the problem and either tighten it or swap it out. When that doesn’t work, they’re stuck.
Here’s what’s actually going on. The showerhead was never the problem. Neither was the tub spout. The real culprit is a small but hardworking component sitting inside your shower valve called a cartridge. When that cartridge wears out, water finds its way past it and drips — whether your shower is on or off.
At 5 Corners Plumbing, we get this call all the time. Homeowners in Kirkland and across the greater Seattle area dealing with a Delta shower or tub that just won’t stop dripping. We replace Delta cartridges regularly, and we also handle Moen. Kohler cartridge replacements come up occasionally too, though not nearly as often.
If you’ve got a drip that’s driving you crazy, you’re in the right place. Let’s walk through what’s actually happening inside your valve, and how we fix it.
What Is a Shower Cartridge and What Does It Do?
Most people have never heard of a shower cartridge, and that makes sense — it’s hidden inside the valve body behind your wall, so you never see it. But it’s doing a lot of work every single time you turn on your shower or bath.
The cartridge is what controls two things: the mix of hot and cold water, and the flow of water itself. When you turn your handle to the left for hot or the right for cold, you’re moving the cartridge. When you push or pull the handle to turn the water on and off, that’s the cartridge too.
Inside the cartridge are seals and o-rings that keep water from sneaking past when the valve is in the off position. Over years of daily use, those seals wear down. When they do, water gets past them and you end up with that drip at the showerhead or tub spout — even with the handle fully off.
The valve body itself — the brass fitting that’s permanently attached inside your wall — is almost never the problem. It’s the cartridge inside it that wears out. And while replacing the cartridge restores the valve to like-new performance without opening up your wall, it’s not always a simple job. Cartridges can be stubborn to remove after 15 or 20 years, and getting the wrong one ordered means starting over.
Shower-Only vs Tub/Shower Combo — Where the Drip Shows Up
One thing that confuses a lot of homeowners is where exactly the drip is coming from, and what that tells us about the problem.
If you have a shower-only setup, the drip shows up at the showerhead. If you have a tub/shower combo — where you can divert water between the tub spout and the showerhead — the drip typically shows up at the tub spout. In both cases, the valve is in the off position and water is still finding its way through. Same root cause, just a different place where it shows up.
Here’s something worth knowing about tub/shower combos. The diverter — the little lever or button you use to send water up to the showerhead instead of out the tub spout — is a separate component from the cartridge. So if your tub spout is dripping, that points to the cartridge in the main valve, not the diverter.
It doesn’t matter whether you have a shower-only valve or a tub/shower combo. If water is dripping when everything is turned off, the cartridge is the first place we look. And in the vast majority of calls we get in Kirkland, that’s exactly where the problem is.
Why Delta Cartridge Replacement Is the Most Common Call We Get
Delta is one of the most popular shower valve brands in the country, and Kirkland is no exception. A huge number of homes here were built or remodeled with Delta valves, which means when cartridges start reaching the end of their lifespan, we hear about it.
And that lifespan? Generally around 15 to 20 years. After that, the internal components simply wear out from years of daily use. Morning showers, evening baths, kids, guests — it adds up. That’s not a sign that anything went wrong — it’s just normal wear on a component that’s been doing its job faithfully for a long time.
Moen is the second most common brand we see. Moen has their own cartridge design, and replacement follows a similar process. We handle those regularly as well.
Kohler comes up occasionally. Kohler valves are well built, but cartridge replacements on Kohler are less common in our service area. When we do get that call, we handle it — but if you’ve got a Kohler, don’t be surprised if we tell you it’s not something we run into every week.
What all three brands have in common is this: when the cartridge wears out, the valve drips. And when the valve drips, the fix is replacing the cartridge — not the showerhead, not the handle, not the trim. The cartridge.
How We Diagnose the Problem Before We Show Up
One of the things that makes cartridge replacement a little different from other plumbing repairs is that we can’t just show up with a van full of every cartridge ever made and figure it out on the spot. Delta alone has made dozens of different valve models over the years, and each one takes a specific cartridge. Order the wrong one and you’re looking at a delay while the right part gets sourced.
That’s why before we schedule the job, we ask customers to send us photos. Specifically, we want to see the valve handle and trim — what’s visible on the wall. That gives us enough information to identify the valve series and track down the correct replacement cartridge before we ever set foot in your home.
It sounds like a small thing but it makes a real difference. Nobody wants a plumber to show up, pull the handle off, and then tell you they need to come back another day because they ordered the wrong part. Getting the identification right upfront means we come prepared, the job gets done in one visit, and you’re not stuck with a non-functional shower while you wait.
So if you’re calling us about a dripping Delta valve, have your phone handy. We’re going to ask for a couple of photos, and that’s actually a good sign — it means we’re doing our homework before we show up at your door.
What the Replacement Process Looks Like
Once we’ve identified the correct cartridge and it’s in hand, here’s what the actual replacement looks like when we show up.
First, we shut off the water supply to the shower. Depending on your home’s setup, that might be at a dedicated shut-off for the bathroom, or at the main water supply for the house.
Next, we remove the handle and trim plate — the decorative pieces you see on the wall. These come off to expose the valve body underneath. This is also where things can get interesting. After 15 or 20 years, handles and trim can be stubborn. Screws corrode, parts get stuck, and what looks straightforward on paper requires some patience and the right tools in practice.
Once we have access to the valve body, we extract the old cartridge. This is the step that can really vary job to job. Some cartridges come out without much of a fight. Others have been in there so long they need a cartridge puller tool and some coaxing. Forcing it the wrong way can damage the valve body, which is a much bigger problem than a dripping cartridge.
With the old cartridge out, we install the new one, making sure it’s oriented correctly — this matters, because an upside down cartridge means your hot and cold are reversed. Then we reassemble the trim and handle, turn the water back on, and test to make sure the drip is gone and the temperature control is working properly.
Can We Upgrade the Handle or Trim at the Same Time?
Replacing the cartridge is a great opportunity to take a look at the rest of the valve trim and decide if you want to freshen things up. If your handle and trim plate are dated, discolored, or just not your style anymore, swapping them out at the same time as the cartridge makes a lot of sense. The valve is already being serviced, so it’s a natural time to make that change.
The key thing here is that we need to know about this before we show up. If you’re thinking about changing the finish — going from chrome to brushed nickel, for example, or updating the handle style — let us know when you call. That way we can make sure we’re ordering the right trim kit to match your new cartridge, and we arrive with everything needed to get it all done in one visit.
It’s also worth knowing that trim kits need to be compatible with your specific valve series. You can’t just pick any handle you like the look of and expect it to fit. Delta makes trim kits designed for their specific valve bodies, so we’ll help you figure out what your options are based on the valve you have.
If you’re happy with your current handle and trim and just want the drip fixed, that’s completely fine too. Most of our customers just want the dripping to stop. But if a refresh sounds appealing, just mention it when you reach out and we’ll talk through the options before we come out.
How Long Does a Cartridge Last?
This is one of the most common questions we get after a cartridge replacement — how long before I have to do this again?
The honest answer is a long time. Delta cartridges typically give you 15 to 20 years of reliable service before you start seeing problems. Some go longer. If you just had yours replaced, you’re likely not going to be thinking about this again for a very long time.
It’s worth putting that in perspective. A cartridge replacement every 15 to 20 years on a shower you use every single day is pretty reasonable maintenance. It’s not like replacing a furnace filter or getting the gutters cleaned. It’s more like replacing a water heater — something you do once, forget about for a long time, and then deal with again when the time comes.
There’s nothing you did wrong if your cartridge wore out. There’s nothing you can do differently to make the next one last longer either. It’s just a wear item. The internal components have a finite lifespan, and when they reach it, the valve starts to drip. That’s the signal. When you hear that drip and the handle is fully off, it’s time to call.
The Seattle area doesn’t have the kind of hard water that accelerates cartridge wear in some other parts of the country, so you’re not fighting that battle here. What you’ve got is just normal wear over time — and a straightforward repair when the time comes.
Why Call 5 Corners Instead of DIY
Cartridge replacement shows up on a lot of DIY plumbing lists online. And technically, yes — it’s possible to do it yourself. But there’s a gap between possible and advisable, and it’s worth being honest about what that gap looks like.
The first challenge is getting the right cartridge. As we mentioned earlier, Delta has made a lot of different valve models over the years. Identifying the correct cartridge for your specific valve isn’t always obvious, especially if you’re not familiar with what you’re looking at. Order the wrong one and you’ve wasted time and money, and your shower is still dripping.
The second challenge is getting the old cartridge out. After 15 or 20 years, that cartridge can be really stuck. There’s a specific tool — a cartridge puller — that makes this job significantly easier. Without it, there’s a real risk of damaging the valve body trying to force the cartridge out. Replacing a valve body means opening the wall. That’s a very different job than replacing a cartridge.
The third thing is reassembly. Getting the cartridge oriented correctly matters. A cartridge installed upside down means your hot and cold are reversed — not dangerous, but annoying, and something that requires pulling it all apart again to fix.
We’ve been serving Kirkland and the greater Seattle area for years, and this is the kind of work we do regularly. If you’d like to know more about who we are and how we work, you can visit our About Us page. We show up prepared, we get the right part the first time, and we get the job done without surprises.
That drip isn’t going to fix itself. If you’ve got a Delta shower or tub spout that’s dripping, give 5 Corners Plumbing a call. We serve Kirkland and the greater Seattle area, and we’re happy to talk through what you’re seeing before we schedule anything. Reach out today and let’s get that drip taken care of.