Community Forums

Mr_D · 08-30-2018, 05:44 PM

Motorcycle cable lube unit that I've had for almost 50 years

txcpl · 08-31-2018, 03:35 AM

It is very important that you know which type of valve connection style is installed on your RV. I found that cabled valves come from at least 2 different manufacturers(for cable connection style), and they come in various lengths, usually in 3 ft. intervals. You would be wise to contact the manufacturer to find out the correct valve cable length. You can open up the coroplast to visually get a take on the valve connection style for your RV. Below is a copy of a post describing what I went through to change a black tank valve on our 5'er.

I had to replace a black water tank valve last year on our 5'er. To start, I used the leveling system to tilt the RV to get as much out of the tanks and lines as possible. Then I tilted the RV using the leveling system the opposite way to keep any remaining liquid inside the tanks. I dropped the coroplast, along with some insulation, and set them aside. There was not enough room to use a regular saw, so I used a cable pvc saw to cut the ABS plastic pipe. Next I removed the 4 screws to remove the valve. Using this method, I left one connecting end of the offending valve on the ABS pipe and simply installed the new valve. I also used a file to de-burr the ABS where I cut it with the cable saw. I installed a rubber boot to connect the ABS pipe where I had sawn it apart. Next I replaced the insulation and coroplast. However, it was windy that day and I had to have help holding the insulation and coroplast in place while reinstalling it. I also used a couple of 1x2x8 pieces of wood to help hold the insulation in place.

I only encountered 3 drops of "stuff" while performing this task.

Be sure you have the correct waste water valve on hand before you begin this project. Contact your manufacturer prior to starting this project if you have any questions about the correct valve. I had to order a specific one for my RV. The rubber boot is available in the plumbing section of any hardware or big box store. The only time a 2nd person is helpful is the replacing of the insulation and coroplast.

Its not a hard job at all. I did mine in a morning. Get your materials and tools set out, turn on some tunes, and get to work.

Good luck.

poppyof5 · 08-31-2018, 05:25 PM

Poss a dumb question but couldn't you drain and clean the tank open the valve with the hose disconected and run a snake back up the pipe to clear any blockage ?

txcpl · 09-01-2018, 03:39 AM

The answer to your question is YES - IF there is a substantial blockage. In most cases the cable, if so equipped, is not working properly, or the gate valve has a small build up of "gunk" in the area where the gate slides. The latter happened to me.

poppyof5 · 09-01-2018, 09:15 AM

Thank you

routemaster · 09-02-2018, 07:56 AM

I just replaced our black tank valve because it was not closing all the way, see gaps around the blade allso there was solid chunks there? and now we know why This valve has been in the 5er for 5 years full timing.
Den.