Thursday, October 6, 2022


My two favorite black tank dumpin’ gadgets

By Tony Barthel
Dealing with the black tank is one of the least enjoyable parts of the RV lifestyle. When a product comes along that makes the process even a little bit friendlier, I’m in. As such, two Camco products have really made my black tank dealings less miserable and have taken some of the frustration out of parts of this process. 

RhinoFLEX RV Sewer Fitting Wrench Set

The first is the RhinoFLEX RV Sewer Fitting Wrench Set. Essentially this is simply a two-piece plastic wrench that goes around your sewer hose fitting and provides enough leverage to make sure that it locks properly in place. 

Using the two handles on the sewer fitting wrench, you grab the sewer hose where it comes together and use this product to lock it in place. I have found a wee bit of bar soap on the fittings also helps to encourage these pieces to come together without gumming them up nor causing any other damage. 

Camco sewer hose wrench

Bending over and trying to convince two pieces of a sewer hose to lock in place is not how I want to spend my last day at camp and the darned hose always seems more reticent if the night before was spent with friends around the campfire who share my love of craft beer and feel that I should try all the varieties that were brought. 

Rather than practicing the words my mother warned me not to say, this simple two-piece wrench snicks the hose fittings together so I don’t have a larger issue to deal with.

You can buy one for yourself here

Camco RhinoFLEX six-in-one sewer cleanout plug wrench

The second is the Camco RhinoFLEX six-in-one sewer cleanout plug wrench. This is another simple plastic wrench but is designed to convince the sewer cap at the campground that you really do mean business. Essentially it has six different fittings molded into the ends of the wrench enabling you to open sewer caps of all sizes. 

Camco sewer wrench

I have found that sand and other grit gets into these sewer caps and while a plumber’s wrench would certainly get this job done, this simple lightweight Camco wrench does just fine and doesn’t weigh down the black tank tote in my camper by much. This is one of those tools that I use very infrequently, but when I need it I am thrilled that it’s aboard. 

I was recently teaching an RV 101 class at Clear Lake Campground and loaned my sewer fitting wrench set to a fellow camper. She had had trouble getting the two lengths of her sewer hose to seat well, which had resulted in one of those situations you don’t want on YouTube. These simple plastic wrenches got the job done and she was a happy camper with zero unfortunate spills. 

Since the wrench set is so lightweight, it doesn’t add much weight to your sewer contraption box, but it certainly does the job well and is quite handy. 

It’s also clear that the folks at Camco are either avid RVers or are listening to RVers, as these simple, lightweight but very usable tools are just a few of the things I have in my RV from Camco that just make the whole experience a little bit more pleasant. I also feel a little bit better about buying them since they’re made in the USA. 

You can get one of these wrenches here.



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7 months ago

These seem to be useful tools, but in 25+ years of rv’ing I’ve only had one sewer cap stuck beyond hand tight. I found two hefty twigs nearby maybe 1/2″ thick by 18″ or so, placed each one on either side of the square cap and squeezed them together from each end. The 18″ of leverage (really 9″ on each side) gave me enough to open the cap. And, there was the campfire’s first kindling!

7 months ago

For people who have sewer hoses difficult to twist off/on- buy the new Thetford Titan It has an oversized coupler that’s very easy to grip and a high quality hose as well. I bought it for my daughter- we both struggled with the Valterra ones and when the wire broke through the hose that was enough….off to the garbage.

7 months ago

I have a Fram oil filter wrench that does triple duty. It looses my oil filter, the filter cans on our water filters plus locking and loosing my sewer hoses. Only need to carry one wrench.

Tony Grigg
7 months ago

I bought that hose wrench and threw it away shortly after. I found it clumsy and not very effective. I now have an oil filter wrench that is like a large pliers that is easy to grip onto the connector ring and provides plenty of leverage. I don’t need it often, but when I do it works fast and easy.

Lance Craig
1 year ago

I have both of these tools. The square cap wrench is okay, but the hose wrench will not work on my hose fittings. Before buying, check that your fitting will work with the wrench. Like some others, I found an oil filter wrench fits almost anything.

Richard Hughes
1 year ago
Reply to  Lance Craig

I agree. It doesn’t work on any of the fittings from any of the manufacturers.

1 year ago

Macerator rules!

Jim Langley
1 year ago

Thanks for the tips and links to these tools, Tony!

Donald N Wright
1 year ago

I just purchased a used Airstream, those tools were aboard. I had no idea what they were for. Thank you..

Paul S Goldberg
1 year ago

Just ordered the 6 in one cleanout wrench. After 20 years of RVing during which I have gotten out a plumbers tool a few times to extract a sewer cap I ran into a cap with an indented slot! I was able to extract it using just my fingers, but the tool would have made it easier. For less than $8 I have a place for it in my sewer tool kit. It will also help keep my fingers away from the cap, maybe.

1 year ago

I carry way too many tools , including drills , sockets , pliers ,terminals , bungees, tyewraps , tape etc , so i find these USELESS but that is only ME !
others are different and if it helps them then its great
and they wont rust if they are thrown in the rv metal box …

7 months ago
Reply to  Claudio

I agree. Never had an issue easily connecting a sewer hose. It’s not like it requires 100 ft lbs to turn and lock.

The sewer caps sometimes are tight and that tool looks good, but if one already carries a few wrenches that are good for multiple purposes, it’s not needed.

When adding tools, I like to select ones that are multi-function as much as possible. Keeps the clutter and weight down.

Donald E Pearce Sr
1 year ago

The sewer hose wrenches do help when there is the occasional need. I do have large water pump plyers for the campground cap (when needed). Many campgrounds are now using the spring loaded caps that solves that issue, though. Only one note about safety. Please bring/use disposable hand protection/gloves! Remember, take only pictures, and leave only footprints!
Stay safe, healthy, and enjoy the great American outdoors!

Vanessa Simmons
2 years ago

I have both of these. I was using the wrench to try to get the hose on the kitchen valve and broke it. They don’t fit really tight on any hoses I’ve tried but they do help some.

2 years ago

In 12 years of RVing, I never had trouble twisting my Rhino Flex hose connector on to the RV. Just keep the connection clean. And OMG a pair of channel locks will unscrew that sewer cap, and they have a lot more uses than that sewer cap wrench that only fits one size sewer cap. Hell most sewer caps half the time, or gone. What a waste of money.

2 years ago
Reply to  SDW

Oil filter pliers work well, are metal and cheaper.

1 year ago
Reply to  Robbie

My first travel trailer, and we just tested it. Came home to test the drain hose directly into our septic tank. No problem getting it on, but getting it off, no way (standard Camco 20′ hose.) I’ll be definitely digging out the oil filter wrench, or buying a 5″ channel lock pliers- don’t think I’ve ever had one that big, despite having most tools.
Anyway, the article and the discussion is very valuable to help avoid issues when out at a campsite…

Sandy Perley
1 year ago
Reply to  Tony Barthel

Thank you Tony for that reply! As a single senior female with arthritis in my hands I find it very difficult to get my sewer fittings in place. I have the ring wrench but I don’t really understand quite how to use it. The fitting on my class c is really low and close to the ground and hard to see as well. I would love to see a video on how to use it!

Debbie Ann Hansen
1 year ago
Reply to  Tony Barthel

Well stated and agree I am a single older woman who appreciates new ideas!

Robert C
1 year ago
Reply to  SDW

Your insulting comment was not necessary or mature, SDW. You sound more like a millennial in your comment. Why not keep it friendly and helpful?

1 year ago
Reply to  Robert C

THe millenials I know are inquisitive, intelligent and respectful. Sorry you’ve met the wrong ones folks.

Old Timer
1 year ago
Reply to  SDW

Usually we mirror the way we feel about ourselves in our comments to others. It isn’t a stretch to understand this concept. The fruit that falls from the tree is a product of the tree. I know because I’m prone to make the same comments. I think my tough approach is best. Been working on it, but this tree had been growing in “that” for a while. Well see how it goes. Good luck all. The nice thing about Rving is that you learn so much.

Paul sprague
1 year ago
Reply to  SDW

Your insults are nothing short of ignorant. While I agree there are many tools that can do the “job” for those people with diminished strength in their hands due to aging etc these tools can be very helpful.

1 year ago
Reply to  SDW

Let’s agree to disagree. I have every tool known to man (according to my DW). But sometimes people don’t have all these tools and these simple wrenches may allow someone to continue to camp. So I’m glad you don’t need them but kudos to anyone who needs them to keep going.

Last edited 1 year ago by Steve
1 year ago
Reply to  SDW

Maybe that’s because your connectors are old and easy to unsnap. The newer ones snap crazy tight and then are very difficult to undo.

The wrench stays in the stinky sewer hatch, I don’t want my clean channellock anywhere near a sewer pipe. p.s. it’s not the cap that’s the problem. Its when your cone fitting won’t come loose from the pipe that you need the larger end, working from inside.

If you don’t need them, don’t buy them, but they are godsend for some of us. My only complaint is when a pipe is ‘sunk’ the flat wrench can’t get in there.

martin a
7 months ago
Reply to  wanderer

the tool has 4 nubs at the corners of the larger end, turn those down and the fit perfectly in the 4 notches in the top of the cone. It would come with instructions, it took me a while to figure that one out.

martin a
7 months ago
Reply to  martin a

I tried to edit, it should come with instructions

Reinhard Dunse
2 years ago

Why not combine the two tools into one. Space is always limited in a RV

Bob P
2 years ago
Reply to  Reinhard Dunse

They couldn’t make twice the profit if it was just one wrench. I just carry a standard adjustable water pump style pliers, never had a fitting they wouldn’t work on

2 years ago
Reply to  Bob P

That’s what I told him. And like I said in my comment. Most of the time there’s not even a cover on the sewer pipe because no one wants to touch it to put it back on.

Kevin Watts
1 year ago
Reply to  SDW

Maybe some people just don’t want to use their everyday tools on the poop equipment.