What You Need to Know Before Starting
Replacing an RV shower faucet is a job you can do yourself in one to two hours with basic tools — no plumber needed. The process is simpler than a home bathroom replacement because RV plumbing runs on lower pressure and uses smaller, lighter fixtures. You will need to turn off your water supply, remove the old faucet, and install the new one by hand-tightening connections and securing it to the wall.
The main difference from a house shower is that RV faucets mount directly to thin wall material (usually fiberglass or aluminum) rather than solid framing, so you cannot use the same heavy-duty anchors. You also need to know whether your RV uses city water, a tank system, or both — this affects how you shut off the water and what you might find behind the wall when you remove the old faucet.
Key Takeaways
- Turn off your RV's water supply at the main valve before you begin, and open a faucet elsewhere to release pressure from the lines.
- Most RV shower faucets are held in place by a single nut behind the wall and connected by two flexible hoses that hand-tighten without tools.
- Measure your old faucet's mounting hole spacing and the length of the spout before ordering a replacement, because RV faucets come in different sizes.
- Use plumber's tape (also called thread seal tape) on all threaded connections to prevent leaks, and hand-tighten only — over-tightening will crack the plastic fittings.
- Test for leaks by running water for two minutes before you close up the wall or reinstall trim, because catching a leak early saves you from water damage inside the wall.
Gather Your Tools and Materials
You need very little to replace an RV shower faucet. Gather an adjustable wrench or crescent wrench (one is enough), a screwdriver set, plumber's tape (the white Teflon tape sold in any hardware store), a flashlight or headlamp, and a bucket or towel to catch water that drains from the lines. If your old faucet is stuck, a penetrating oil like WD-40 helps loosen corroded connections.
Before you buy a replacement faucet, measure the distance between the two water inlet holes on your current faucet (this is called the center-to-center spacing) and the length of the spout from the wall to the tip. RV faucets typically come in 4-inch or 8-inch spacing, and spout lengths vary from 4 to 7 inches. Measure twice — ordering the wrong size means returning it and waiting for a replacement.
You will also want to know your faucet's brand and model number if you can find it, because some RV faucets are proprietary and have specific replacement parts. Check the underside of your current faucet or look in your RV's manual. If you cannot find it, take a photo of the faucet and bring it to an RV supply store — staff there can usually match it by sight.
Turn Off the Water and Relieve Pressure
Locate your RV's main water shutoff valve. If you are connected to city water, the valve is usually on the exterior of the RV near the water inlet, or inside a cabinet near the fresh water tank. If you run on tank water only, the valve is typically inside a cabinet under the kitchen sink or in the wet bay. Turn the valve clockwise until it stops — do not force it.
After shutting off the valve, open the shower faucet and let water run for 10 to 15 seconds to release pressure from the lines. You may also open a sink faucet or toilet to drain more water. This step prevents water from spraying out when you disconnect the hoses. Place a bucket or towel under the shower to catch any remaining water in the supply lines.
Remove the Old Faucet
Look behind the shower wall where the faucet connects. You will see two flexible hoses (the hot and cold water lines) and a mounting nut that holds the faucet body to the wall. Use your wrench to hold the nut steady while you hand-loosen the two hose connections. If the connections are very tight, spray them with penetrating oil and wait five minutes before trying again.
Once the hoses are disconnected, unscrew the mounting nut by hand or with your wrench. The faucet will come free from the wall. Inspect the hole in the wall — if it is cracked or the fiberglass is damaged, you may need to reinforce it with a backing plate before installing the new faucet. Most RV supply stores sell these plates for under $10.
Before you throw away the old faucet, check whether the flexible hoses are still in good condition. If they look cracked, kinked, or discolored, replace them with new ones rated for RV use. Reusing old hoses is cheaper, but a failed hose inside the wall can cause serious water damage.
Install the New Faucet
Wrap plumber's tape around the threaded ends of the new faucet's inlet ports (where the hoses connect). Wrap the tape clockwise three to four times, pressing it firmly so it does not slip. This tape seals the connection and prevents leaks. Do the same to the threaded ends of your water hoses if they are new.
Push the faucet body through the hole in the wall from the front. From behind the wall, hand-tighten the mounting nut onto the faucet's threaded post. Tighten it snugly but do not use a wrench — hand-tightening is enough, and over-tightening can crack the plastic fittings. The faucet should sit flat against the wall with no gaps.
Connect the hot water hose to the hot inlet (usually marked with red tape or a red ring) and the cold water hose to the cold inlet (usually blue). Hand-tighten both connections. If you are reusing old hoses, make sure they are not kinked or twisted. If you installed new hoses, check that they are long enough to reach without stretching.
Test for Leaks Before Closing the Wall
Turn the main water valve back on slowly. Open the shower faucet and let water run for at least two minutes. Watch the connections behind the wall for any drips or sprays. If you see water leaking from a hose connection, turn off the water, wait for it to drain, and tighten that connection by a quarter turn with your wrench. Do not over-tighten.
Check the mounting nut as well — if water is leaking from where the faucet body meets the wall, the nut may need tightening. If tightening does not stop the leak, the faucet body itself may be cracked, and you will need to replace it. This is rare with new faucets, but it happens occasionally with damaged shipments.
Once you confirm there are no leaks, run hot water for 30 seconds to make sure the hot line is working. Then run cold water for 30 seconds. Test the handle or knob to confirm it moves smoothly and controls the water flow. If everything works, you can close up the wall or reinstall any trim or panels you removed.
Common Problems and How to Fix Them
If water leaks from the handle or spout when you turn the faucet off, the cartridge or valve inside may be defective. Most RV faucets have a replaceable cartridge that costs $15 to $40 and takes 10 minutes to swap out. Check your faucet's manual or contact the manufacturer to order the correct cartridge for your model.
If the faucet does not get hot water even though the hot line is connected, air may be trapped in the line. Open the hot faucet and let it run for one to two minutes — the air will eventually push out and hot water will flow. If hot water never arrives, check that the hot water tank is on and that the valve connecting the tank to the water lines is open.
If the faucet is loose or wobbles when you touch it, the mounting nut behind the wall has come loose. Tighten it by hand from behind the wall, or use your wrench if it is too tight to turn by hand. A loose faucet can eventually crack the wall material, so do not ignore this.
Frequently Asked Questions
Can I replace an RV shower faucet without turning off the water?
No. If you do not turn off the water first, it will spray out when you disconnect the hoses, and you risk damaging the wall and your belongings. Always shut off the main valve and release pressure before you start.
What if I cannot find the main water shutoff valve?
Check your RV's manual — it will show the location. If you do not have the manual, look in cabinets under sinks, in the wet bay, or on the exterior wall near the water inlet. If you still cannot find it, contact your RV's manufacturer with your model number and they can tell you where it is.
Do I need to use plumber's tape on every connection?
Yes. Plumber's tape is cheap and prevents leaks at every threaded joint. It takes 30 seconds to wrap and saves you from water damage. Always use it on the inlet ports and on the hose connections.
How tight should I make the connections?
Hand-tighten until you feel resistance, then stop. RV faucets use plastic fittings that crack easily if over-tightened. If a connection leaks after hand-tightening, use your wrench to tighten it by a quarter turn only — not a full turn.
What if the new faucet does not fit the old mounting hole?
If the hole is too large, you can use a backing plate (a metal or plastic ring that sits behind the wall and distributes the mounting nut's pressure). If the hole is too small, you will need to carefully enlarge it with a drill or hole saw. Measure the new faucet's hole size before you start, and use a template if the faucet came with one.