What Is Fullway Termination Valve: And Where Is It Located?


If you are the proud owner of an automobile vehicle such as an RV, you need to be familiar with the part names. One of these parts is the fullway termination valve. It plays a very crucial role in the overall functionality of the RV.

The fullway termination valve is the particular valve which you need to open for emptying out all the black water from the tank. Although it goes by many names, the valve is typically found beneath your vehicle’s drain outlet.

As an owner, you must learn every detail about this valve and be in the right place. This article will discuss the exact specifics of the fullway termination valve on your RV. You will get to know about the exact placement of the valve as well as other relevant aspects.


What Is Fullway Termination Valve?

The Fullway termination valve has multiple names in the automobile and RV industry. It is also known as the gate or black water drain valve. 

Sometimes, it is called the black water dump or the drain valve. No matter what it is called, the functions and mechanisms of this valve are the same in all cars. 

The Fullway termination valve is the large valve at the bottom of the RV that leads to the tank. It is a pull-handle valve that is connected to the sewer line. 

There is a hose attached to it that leads to the sewer line. You will notice a huge warning sign beside the valve to remind you to pull it every time you flush. 

The fullway termination valve is located underneath the RV, where the drain outlets are.

Read Also: How Much Can A Chevy Suburban 2500 Tow? (Capacity Chart)

How The Fullway Termination Valve Works

The main function of the Fullway termination valve is to drain all the black water from the tank. You must always pull this valve before using the flush system. 

Otherwise, you will face a huge unhygienic mess right on your hands and all over your RV. The black water enters the dump station tank this way. This same way is used for the black water to flow outside as well. 

Because of this, the Fullway termination valve is also known as the gate valve. Before you use the flush system of the RV, you need to pull this Fullway termination valve. 

Pulling it will let all the black water out of the tank first. Then you can proceed to flush the entire system. If you forget to pull the valve before flushing, the black water will go up to the roof of the vents and spill out. 

The water can overfill and leak out from the vent-pipe connection of the RV. This is extremely unsanitary and can cause severe illnesses.

Read Also: Why 15 Amp Fuse Keeps Blowing In Rv: How to Fix it?

Where Is The Fullway Termination Valve Located?

Usually, you will easily be able to locate your fullway termination valve under the RV where the tank is. There might be a few confusions due to the different models and differences in instruction manuals to find this valve on your RV. 

Here we will mention the specific RV model and the exact location of the valve on that RV for your convenience.

Camper Trailer

On Camper vans, you will find the Fullway Termination Valve on the lowest part of the van. It will be right at the exact same spot where the black tank is located on your camper van. 

If you are still confused, look for the point where the black water leaves the tank to go to the sewer line, and you will be able to locate the valve. 


On your Winnebago RV, the valve will be right underneath your RV. It is located at the part labeled as the water service center. The handle will be black for easier recognition. 

Right beside it, you will find another white handle which opens up the drain to let the water out. Pull these valves before activating the waste dump button for a safe flush.


Keystone RV manuals usually state the black water drain valve location instead of the fullway termination valve. But both of them are the same thing. 

You will find two valves next to your tank- a gray water valve and a black valve. The black one is the fullway termination valve you’re looking for.


Airstream RVs mention the black water dump valve in their manual, which is exactly what you will be looking for. The valve will be near the drain outlets of the RV. 

These drain outlets are under the Airstream. There is also a water inlet valve in these vehicles, which might be confusing to differentiate at first.

Read Also: Complete Guide on How to Jack Up a Travel Trailer in 4 Steps


In this section, we will cover all the most frequently asked questions about the fullway termination valve. You will find the answers here if there is something left that we have not covered in the above discussion.

When Do I Need to Use the Fullway Termination Valve?

The Fullway Termination Valve must be opened every time before you flush the water tank. The valve first allows all the black water to go down the sewer line. After that, the flush works and ensures a perfect spotless flushing system.

How Long Should I Flush My Black Tank?

It is recommended to flush the black tank until the water is completely cleared away from the sewer hose. In most cases, it takes 2 to 3 minutes to clear the water. You can check through the 90-degree connector pipe first to see if the water has cleared away. 

How Often Should I Flush Black Tanks?

You should flush the black tank once a month for the best hygiene. It is also viable to flush it every two months. Ensure not to flush the black tank too often to wear the tank out. However, do not let the tank get too dirty by going too long without flushing it.

What Happens If The Fullway Termination Valve Is Closed During Flushing?

If the fullway termination valve is closed while you are flushing the black tank, the tank will definitely overflow. The tank will fill up with dirty black water and, at one point, burst, squirt, or flood the area. The black water will leak out on the roof through the vent pipes and create an unsanitary mess.

Read Also: When To Use The Check Valve, Before Or After Pump? Find Out!


Most people struggle to find the exact location of the fullway termination valve in their RV because of the varying names of it. Different manufacturers and different RV industries include a separate name for this valve. 

As a result, the users get confused trying to locate the valve. Flushing the water tank without locating this valve will lead to a whole health and property hazard. In this article, we have included the exact locations of the valve on different models of RV. 

Make sure to pay attention to the warning label beside the valve so that you never forget to pull it. Thus, you can safely drain the water and flush the tank without causing any kind of inconvenience to the RV.

Read Also: Why Your RV Oven Pilot Won’t Light and What to Do About It?

Similar Posts