srenovo wrote:
I wanted to do this same thing in our 2016 Fleetwood Southwind.
Below is my explanation of what I did along with help from my plumber.
My plumbers dad (company owner) said when I called about helping to install the Toto Washlet seat was that they did not work in motorhomes BUT if I had everything he would send his son (who I like working with) and he would see that everything was taken care of - if and only if I had all the parts necessary for the job. So I did my research - got the Toto Washlet toilet seat - ordered the one special part needed from the toilet manufacturer (Dometic). Then I discovered that the plumping tee sent with the Washlet seat was made with metric threads on one end and it had to be used and there was no substitute as the connection port for water to the Washlet seat was also proprietary to Toto.
I spent a half a day in hardware stores looking for a solution. Finally came up with the solution late two nights ago on my own.
I can send pictures of the completed installation.
Below is my explanation of what I did -
As for the Toto in the MH – there is only one RV toilet model that allows such an installation and as luck would have it our RV came with the correct toilet. Therefore, I did not need to buy a new toilet. It is the Dometic 310/311 models.
My plumber had his part of the job done in much less than an hour. I did the most difficult parts of the job for him before he got to my RV. One part required “Southern Engineering” and the other part was to have the special piece that had to be ordered on hand. There are other RV owners that have done the same thing to their RV so I had an idea of the special part that had to be ordered plus I talked with staff at Dometic to verify all that I had learned.
Each of these RV installations is probably a little different but for my installation I had to re-engineer the Toto tee that sends water to the Toto Washlet. Normally the Toto tee attaches to both the water supply from the house and the bottom of the toilet tank and has a connection for the hose from the Toto toilet seat. I had to plug the end of the tee that would attach to the bottom of the toilet tank. I did that by removing the reverse threaded brass insert on the end that would attach to the toilet tank; tapping the inside of the inner round end of the brass reverse threaded insert to 5/16 X 16; and screwing in a 5/16 X 16 set screw using thread sealer to be extra sure that it would not leak. Finally I reinstalled the reverse threaded brass insert with the same Allen wrench used to remove it.
This plugged the hole that would normally let water into the toilet tank – since RV toilets do not have a tank. The pressure of city water when connected to a city water hose bib or the pressure of the RV water pump when using water from the RV’s water tank provides the flow necessary to feed the Washlet seat as well as rinse out solids – if the solids are sticky there is a spray wand for final cleaning. Because of their design RV toilet and simple marine toilets are directly above the “black water” tank and operate using gravity.
My plumber cut the existing PEX tubing bringing water to the toilet. He next used the PEX valve I purchase as well as a short toilet water inlet hose and to hook up the water to the toilet. The only other job for him was to install a “vacuum breaker apparatus that stood further back from the rear of the porcelain bowl (to replace the existing one) which I ordered from Dometic (The toilet manufacturer). This part allows enough room for the seat to fit properly. I am not the first person to do this but I may have had the easiest installation as I figured it all out for my plumber in advance. Toto does not make a modified tee adapter for RVs so I believe as does my plumber that I was very creative in solving the problem. Since this Washlet was made for installation in Mexico and accidently sent to the USA the threaded portion at the top of the Tee was metric instead of SAE. There was no plug available locally to block the flow of water headed to the non-existent toilet tank. Toto’s fittings are specialized to Toto products so my solution was clever. Finally one piece of white 1/2 flexible tubing had to be replaced with a longer piece and I even had that available.
Hmmmmmm......the OP "holstein13" posted his question 8-16-2014.
"Srenovo" posted the above 9-22-2017.
Certainly good info on solving the "problem"!!
However, in the intervening THREE YEARS.....
did "holstein13" ever figure out a solution to his dilemma??
:h
:@
