rv water heater drain plug size

RV Water Heater Drain Plug Size- The 360 Guide


Replacing a drain plug might be the last thing on your mind while cruising in your RV. Well why wouldn’t it be? Maintaining an RV comes with keeping up with so many things.

However, you simply can’t ignore it. You see, the drain plug has to be replaced once in a while, or else it will create another nuisance. That’s why people tend to get it replaced every year. 

And you might be one of them. But while trying to replace you might wonder about the plug size.

What is the actual rv water drain plug size and how do you install it?

Well, we will discuss all the answers and that too in detail. So that you can have a clear idea of the concept. Are you for it then? If you then let’s start.

RV Water Heater Drain Plug Size- The Basic Knowhow

So one day you finally decide to make some time to get the old drain plug replaced. But before you start with your work you obviously need a replacement plug.

But the main question is what is the size of the plug, right? Well, it’s in fact a great question. After all, they come in so many sizes so it’s common to get puzzled.

The head size of the plug can be 13/16”, 7 /8” or 15/16” so you might get confused while buying. Well, the correct size for the RV water heater is 15/16”.

So, if you find that anywhere make sure to put it on your shopping list. You will need it sooner or later.

However, most people reuse the old plug. Now, this is a bad idea because the plugs are usually made of nylon. And they wear out as time passes by.

Additionally, the plugs are very cheap. They usually cost between 3 to 5 dollars. So, with a few bucks, you’ll save yourself from the trouble of getting drenched by the water heater.

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How to set the water heater plug in the drain?

Alright, now you know the plug size. But what good will the plug do if you don’t know how to install it? So in addition to the plug size info, we decided to teach you how to plug it in.

And we kept it beginner-friendly. So, you won’t have any problem dealing with the issue at all. So, are you ready? Yes? Great! Let’s start then.


The first thing you have to do is take adequate preparation for the process. So, let’s see what item you’ll use to get the job done.

List of items:

  • A 15/16” Plug
  • A ratchet wrench
  • An extension tape of length 5-10”
  • A bucket

Once you have all these items in your possession get the bucket and position it under the water drain. Otherwise, you’ll be drenched in water that will rush out of the water heater drain.

With that the preparation is complete. Now you can commence the required steps.

Step 1- Take out the old plug

First things first, you need to remove the old plug before you can replace it with a better version. So for this use the wrench that you gathered and pull out the plug.

However, once the plug is removed you’ll see water splurging out like Niagara Falls. So you need to act quickly. To know what to do next move on to the second step.

Step 2- Place the new plug in the socket

By now you must know that you have to tackle the overflowing water. But with what? Well, you have to put the new plug in its place.

To do that hold the new plug near the opening of the drain and twist it in. Initially use your hand to do most of the job. Hold on from using an instrument just yet.

We’ll get to that soon enough.

Step 3- Use a wrench to tighten the plug

For the third step, you have to take out the wrench again. Then use it to tighten the plug so that the water does not burst open the plug.

A few good twists will get the job done. Then comes the work with the extension tape.

Step 4- Cover the plug with extension tape

By now your plug should be in place. But wait, your work isn’t over yet. You still have to ensure that the water does not drip out every now and then.

To seal off the deal you need to tie in some tape around the plug. Or you will occasionally hear the dripping of water.

And that can be quite disturbing when you’re trying to get some sleep. So make sure you tape down the plug before you call it a day.

Step 5- Refill the water heater

The last step that you need to do is refill the water heater. You see, while you were switching the plug some water ran out of the heater.

So, you might want to fill that up before you call it a day. Or else you won’t find any water coming out of the heater when you switch the water heater on.

To sum up

That’s all the steps to install the drain plug in your RV. Now, you know both RV water heater drain plug size and how to install it. So why don’t you get things started?

However, if you face any sort of trouble while getting the job done simply leave a comment below. We will love to help you figure things out.

With that being said we’ll bid our farewell now. Have a nice day. Tata!

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