RV Toilet Flush Valve Leaking [Causes & Easy Fixes]

When you’re on vacation with your family or friends in an RV, a RV toilet flush valve leaking may ruin your trip.

As annoying as it is to watch water seemingly endlessly pour down the drain of your toilet, we understand your frustration. This is why we have come together; to remove such concerns from the day.

Without further ado, therefore, let’s dive in –

Cause of the Dripping Flush Valve

When you push the button for the flush mechanism on your RV toilet, the flush valve, which is located within the tank, releases a valve that enables clean water to flow into the bowl.

Size and construction determine the characteristics of each distinct kind of flush valve. However, the majority of the time, the problem can be traced back to the substance.

The majority of flush valves sold on the market are made of brass or plastic. Plastic flush valves are very common. On the other hand, leaking is something that may occur with any of the flush valves that are now on the market.

Corrosion and unevenness are the most often seen problems. It is even capable of causing the most long-lasting brass flush valve to develop a leak.

The seat of the flush valve will eventually wear down and become uneven in the vast majority of instances. Unfortunately, this may happen if you apply an excessive amount of power while you are putting it in.

It does not make a difference whether you install a flush valve made of plastic or brass. The flush valve made of brass, on the other hand, is more resistant to cracking or breaking than its plastic counterpart.

In any case, it is not uncommon at all if you have leakage difficulties with the flush valve like this one if your RV is an extremely old model. But you have the ability to solve the problem at any time.

Compilation of Required Tools

Don’t fret; you won’t need any unusual tools for this procedure today. Some simple tools can quickly bring you a properly operating toilet.

What you’ll need is listed below.

  • Clean Sheets
  • Screwdriver
  • Clump-Cutting Device
  • A Brand New Flush Valve
  • Tweezers with a Channel Lock
  • A.K.A. Teflon Tape

RV Toilet Flush Valve Leaking- How to Change the Faulty Valve

There is a portable water tank in your RV that you can use to flush the toilet whenever you need to. The water tank will run dry if the leaking flush valve isn’t fixed soon.

Now, let’s have a look at the measures that will speed up the process of fixing everything:

Step 1: Shut Off The Water Main.

The first step is often overlooked, leading to flooded RV bathrooms. So, go ahead and shut off the water supply to the toilet.

Step 2: You Should Flush The Toilet.

Since you’ve already shut off the water, you may as well go to work. Nope. The toilet’s flush tank still has some water in it. Please flush the toilet by pressing the button. When you flush, make sure the tank is completely empty.

Step 3: Turn Off The Supply Lines.

Two pipes may be seen at the slush valve position. You can tell which pipe is the main water supply since it brings water to the flush tank.

When you click the flush button, water from the flush tank flows through the other pipe and into the bowl.

The flush valve serves to join the two pipes together. That’s probably the person or thing you want to put the blame on right now.

Disconnecting the pipes must be done carefully to avoid any leaks. The pipes may not leak heavily, but there is always some water present.

In such case, get a clean, dry cloth and put it beneath the pipes before you open them. In this manner, the towel will be able to absorb all of the moisture.

Gently disconnect the pipes from the toilet’s flush valve. Using your hands to take them off is recommended.

Step 4: Take Out The Broken Flush Valve.

Stop suffering from that headache and do something about it now. You may remove the flush valve by unscrewing it with a screwdriver and then prying it out with pliers.

When taking the flush valve out, be as careful as possible. It is not our intention to compromise the current level of functionality.

If you’re having trouble relocating the object, try using the channel lock pliers. The clump cutter may also be used to remove the outdated clump that has been holding the pipes together.

Step 5: Install The New Flush Valve

We need the replacement flush valve installed in the same location as the previous one as soon as possible, so please have it ready.

Install the new flush valve and fasten it in place using the supplied screws. Tighten it with the screwdriver, taking care not to overtighten it.

Step 6: Closing Off the Supply Lines

With the flush valve installed, you may connect it to the water supply pipes. Tighten it with the channel lock pliers.

However, the seal may be made more reliable by using Teflon tape. Incorporating these tapes into the supply pipe seating arrangements increases their stability. The cluster must be positioned on the supply pipes, as well.

Step 7: The Seventh Step Is To Activate The Water Supply.

Verify that the steps are performed in the order we described. The water may be turned on so that business can resume as usual.

Step 8: Check For Leaks Again

Now that we’ve reached the finish, you should double-check for any leaks you may have overlooked.

Check for the presence of running water by running your fingertips over the flush valve. Using a dry cloth to detect any leak at the valve is another option.


The leaky flush valve on the RV toilet was all the information we had for now. Remember that solving an issue now is always preferable than worrying about it tomorrow.

We don’t want the RV toilet flush valve leaking to interrupt your weekend plans with your loved ones, so let’s get to work on it right immediately.