How to Unclog RV Black Water Vent? [SOLVED]

A clogged RV black water vent is one of the troublesome and disgusting problems most RVers face at least once while RVing for a long time. If you’re new to RVing or if case don’t know yet, most RVs come with two types of storage tanks attached. One is a gray water tank, and the other one is a black water tank. The gray tank stores the drainage water from the shower, whereas the black tank stores the wastewater from the toilet. 

When the excrement accumulates or hardens, the black water vent gets clogged, and the toilet waste can’t empty properly; which makes the situation worse. Therefore, it’ll be pretty valuable if know the procedures for unclogging the black water vent. This is why we’re going to provide them here to help you in this case. Just make sure to read the entire post. 

How to Unclog RV Black Water Vent

Procedures for Unclogging RV Black Water Vent

There are mainly three types of things that clog the black water vent. Those are –

  • Hardened solid excrement
  • Any other solid waste
  • Toilet paper

Also, there are three signs that ensure you have a clogged black water vent –

  • When you flush, nothing goes down through the toilet
  • When you dump, very little or nothing drains from the black water tank
  • Both problems coexist

Now that you have a clear concept of your problem, you’ll understand how the procedures will work in order to solve it. So, without delaying any longer, let’s get into them –

Method 1: Plunge the Toilet

Plunging the RV toilet proves itself useful in most cases. It works by using suction to break up the clog and force it through the vent. So, grab a plunger and make use of it.

Plunge the Toilet

Method 2: Apply Toilet Chemical 

This is another effective method to unclog the black water vent. RV toilet chemicals are specially made for breaking down solid waste. This way the unclogging becomes very convenient. Just pour a few ounces of the chemical into the toilet and flush. Leave it for a few hours or overnight to let the waste break down. After that, flush again. Now, you’ll find everything okay. Camco TST RV Toilet Treatment is mention-worthy.

Apply Toilet Chemical

Method 3: Apply Pressurized Water

Even though it isn’t a conventional method, it proves helpful in some cases. In this case, owners use a garden hose or a pressure washer to blast the clog loose. But the point is that this method requires an experienced person to handle it. Otherwise, there’ll be a risk of damaging the vent pipe.

Apply Pressurized Water

Method 4: Use a Toilet Snake

If the toilet snake is an unknown term to you, it’s a type of drain snake especially designed for toilets. It’s basically a long, flexible instrument that needs to be inserted into the toilet and pushed through into the black water vent to clear clogs. Just make sure to use a suitable one that isn’t prone to cause any internal damage. For example – Cobra Plumbing 20500 Drain Auger.

Use a Toilet Snake


That’s all about unclogging an RV black water tank vent. As you can see, the aforementioned methods aren’t that difficult to apply. All you need to do is to make use of the relevant equipment accordingly which requires a little effort. Still, if you have any confusion or more queries, let us know in the comment section. 

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