Just a little reminder to you guys that may not be aware. If you have the San-T-Flush system in your trailer, be sure that you open the water faucet all the way and close it all the way when using the system. According to the instructions for flushing tanks, failure to open and close the faucets all the way and/or low water pressure could result in possible fresh water leakage from the vacuum breaker.I experienced the results personally and can tell you first hand its not a pleasant event.
I had used the Flush several times before with good results, but had never read the little brochure that came with trailer. ( I'm pretty good at not reading the instructions) At an RV park in North Carolina last fall, I dumped the black tank as usual, closed the black valve and turned the Flush on to do a rinse. While waiting for the tank to fill some, I heard my wife scream that water was running all over the hall and bedroom floors. About the same instant I noticed water coming from under the trailer. Turned the water off as quick as possible, but the damage was done. Water water every where. It even leaked down on my electric valve switches and knocked them out of commission, so I could not open the black tanks. At the time I had no idea what was going on and where all the water was coming from.
After several hours of mopping, drying the switches and searching for the leak I read the instructions. Then I opened the access panel in the bedroom wall to the back of the shower and found the check valve and the vacuum breaker in the Flush system. That was the source of the water leakage. Apparently, I just had not opened the faucet enough and all the water was running out into the wall and floors instead of the tank. Learned my lesson well. Of course I left the access of for a couple of days used fans and dryers to dry everything up. Tested it several times and have never had it happen again.
Jut be sure and open and close your faucet wide open.