Good Sam Club Open Roads Forum: Bathroom Dry Pipe
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Passin' Through

California

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Posted: 09/06/20 06:34pm Link  |  Quote  |  Print  |  Notify Moderator

First of all I want to thank everyone here for several years of entertainment, education, and ideas gained from reading this forum. Although I rarely post, I look forward to visiting the website several times a week.
Here is an addition that has made the draining and flushing of my 5th-wheeler’s black-water tank quite a bit easier. I installed a dry pipe in the bathroom right next to the commode. It is used to fill the tank with additional water just prior to dumping, and to add 5 gallons or so to the emptied tank to prevent the dreaded “poo pyramid” before the next dump (no pun intended). The pipe is “dry” since it is only charged with water when the black tank is emptied.
I used ½” sch.40 PVC pipe to run a line from near the dump connection on the street side, across the underbelly, then up into the bathroom next to the commode where a ½” FPT brass quarter-turn hose bibb controls water flow. The street-side end of the pipe has a ¾” female hose fitting to which my utility hose is connected. In use, a short length of ½” I.D. vinyl tubing is attached to the bibb and pointed straight down the toilet’s open waste valve to add water to the black tank. The tubing must be hand-held during this operation to prevent overfilling of the tank. Mine also has enough curl to it to prevent it from staying in the toilet and thereby eliminating the possibility of a cross-connection with fresh and waste water. When finished the utility hose is stowed and water in the pipe is allowed to drain out for a few moments, the FHT connection is plugged, the bibb is capped (even though it is unnecessary), and the vinyl tubing is put into a large ziplock bag and stored behind the commode. The vinyl has never gotten dirty so I have no qualms about storing it this way.
One caution – after pressurizing the pipe, be very careful opening the quarter-turn valve to fill the black tank. The line will have air in it and can splash water in the commode which can then land in places where it doesn’t belong. Guess how I found this out. In addition, since my utility hose is also used for the tank flusher, I put a hose-end ball valve with a quick-connect fitting between the utility hose and the dry pipe inlet. When a hose switch is needed, I just turn off the ball valve to keep the line full of water, then attach the hose to the tank flush inlet via a brass 90-degree ell which is also equipped with a quick-connect fitting. A reconnect to the dry pipe will let a small amount of air back into the line but I can usually hear it coming through the pipe and close the valve a bit to eliminate splashing.
Here are some pictures that should make things more understandable than my poor efforts at written explanation. I didn't like having to make multiple trips with a 5-gallon water bottle to put in the toilet prior to having to dump a short-filled tank, nor dragging a long hose inside to do the job. Perhaps someone else can benefit from this idea.

Hole in the floor for 1/2" PVC pipe.
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Detail showing homemade drop-ear ell, bibb and cap holder
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Sprayed with satin finish black paint for plastic. The white cap is screwed to a 3/4"MHT x 1/2"MPT connector and used to just keep crud out of the line when not in use.
[image]

* This post was edited 09/06/20 06:46pm by Passin' Through *


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jdc1

Rescue, Ca

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Posted: 09/06/20 07:48pm Link  |  Quote  |  Print  |  Notify Moderator

A Rhino Blaster or Flush King work great too...

Old-Biscuit

Verde Valley

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Posted: 09/06/20 08:32pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 'sprayer' on my toilet that I use to rinse bowel with and if I hold toilet flush pedal down water runs continuously


Is it time for your medication or mine?


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K Charles

Connecticut

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Posted: 09/07/20 07:58am Link  |  Quote  |  Print  |  Notify Moderator

Every camper we ever had the water goes down when you flush the toilet. If you want more water you move the pedal, or lever, the other way.





Passin' Through

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Posted: 09/07/20 10:31am Link  |  Quote  |  Print  |  Notify Moderator

I guess I wasn't too clear as to the purpose of the pipe. It is for putting additional water into the black tank prior to dumping in order to get as much solid material out as possible, then adding about 5 gallons of water after dumping is complete. It is not for flushing the toilet.

K Charles wrote:

Every camper we ever had the water goes down when you flush the toilet. If you want more water you move the pedal, or lever, the other way.


My toilet operates like any other, but filling the tank via the pipe I installed is much faster. To use it, the water pump is turned off (saving onboard water), the toilet flush pedal is depressed and held down, the vinyl tubing is directed into the toilet drain opening, and the bibb turned on. I can sort of gauge the black tank level by the sound the water makes as the tank is filled. When I can see the water in the waste pipe, or it sounds like it is close, I shut off the bibb, go outside, open the tank drain valve, and turn on the black tank flush. The pipe makes a secondary fill and dump, if necessary, much faster as well.

Sorry for any confusion. I am happy to answer questions anyone may have.

Seon

Lake Camanche, CA

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Posted: 09/07/20 11:09am Link  |  Quote  |  Print  |  Notify Moderator

I kind a like your modification. Thx.

naturist

Lynchburg, VA

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Posted: 09/07/20 11:22am Link  |  Quote  |  Print  |  Notify Moderator

That is one solution to a problem we all have, whether we know it or not. Thank you for the idea.

In my case, I came across a bidet at Lowes that consisted of a hand sprayer & fittings. Being tired of the two-liter-coke-bottle full of water used to rinse the back side of the toilet after use to prevent untoward odors, I bought and installed said sprayer on the back of my toilet. Now I have the best of both worlds: a bidet for rinsing off my bum after conducting business AND a sprayer to rinse the back side of the toilet bowl AND an easy way to add those extra gallons the OP mentions.





Edd505

Elephant Butte, NM

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Posted: 09/07/20 02:13pm Link  |  Quote  |  Print  |  Notify Moderator

Hold the pedal down and fill away. Drag a hose in the door and insert in toilet, fill away.

naturist; get a Dometic 310 or 320 they flush all the way around. Shower spay if it still needs help.


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jdc1

Rescue, Ca

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Posted: 09/07/20 03:45pm Link  |  Quote  |  Print  |  Notify Moderator

LOL. I just hook a hose to my Flush King to flush the black tank AND put 5 gallons of water in the tank. 5 gallons = about 1 minute. No need to go into the unit.

Old-Biscuit

Verde Valley

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Posted: 09/07/20 08:46pm Link  |  Quote  |  Print  |  Notify Moderator

jdc1 wrote:

LOL. I just hook a hose to my Flush King to flush the black tank AND put 5 gallons of water in the tank. 5 gallons = about 1 minute. No need to go into the unit.


Ditto....
And it only takes ONE Person
No need for anyone else holding toilet ball valve open, holding a vinyl tube in toilet and having to smell the black tank while putting water in

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