Black tank flush issue
Emptied the black tank today and did as I usually do, hooked up the garden hose to the flush connector and turned it on. The tank had drained to near empty when I turned it on. Lo and behold, the wa...
Forum Discussion
3oaks wrote:Lynnmor wrote:Yep, the more the manufacturers add to RVs, even simple things, the more that can become troublesome. If mine gives me any trouble at all, I will do the same.
I simply eliminated the vacuum breaker, no more water drips.
Our first TT didn't even come with a vacuum breaker in the black tank flush line. It only had a check valve. Our new TT came with a check valve and a vacuum breaker in that line.
1. The aftermarket Black Flush kits have a Check Valve in the water hose inlet, because it is very difficult to install the above floor vacumm breaker/check valve. The aftermarket kits do that to prevent sewer water and SMELL from coming out when the black tank level rises above the spray nozzle.
2. The FACTORY installed system uses that above floor vacumm/check valve usually located under the Lavy sink to keep the odors and the black water from running out when the black water rises above the spray nozzle in the tank. The factory installed systems specifically state that the Inlet does NOT have a check valve. That allows the water in the input water line to drain out when you disconnect the hose.
3. Removing the above floor check valve will then cause odors that will come out at the water bay area where the flush water connection is located. I guess it is also possible, with the check valve removed and the black tank level above the spray nozzle you may get a siphon affect in transit and then have sewer water come out the fill nozzle. I would NOT like to test that theory. Doug
