Quote:
Originally Posted by markcee
Thanks for the replies all. But, I believe the San T system can be used on both tanks - provided you have the model SFS200 San T installed.
I assumed it was for black tank only but the instructions from the manufacturer state "For Black/Grey" Holding Tanks, right on the top, so I wasn't sure.
So, I either have a generic set of instructions I have the dual tank model installed.
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Here's the way Keystone uses the device:
The SAN T FLUSH nozzle is installed in the black tank. PEX tubing is installed from the trailer sidewall outlet (some are in the convenience center) through the trailer interior walls/floors/open spaces. The PEX turns upward, to the bathroom vanity where an anti-siphon valve, which is located high in the vanity space, usually directly under the vanity sink. The PEX is then routed down to the SAN T FLUSH nozzle and the system is connected. You can verify this by opening your vanity door, using a flashlight and count the number of PEX tubes you see. There will be 4. One for hot water to the faucet, one for cold water to the faucet and two for the Black Tank Flush system. Note that in previous years, Keystone did install some anti-siphon valves in the shower wall, but they seem to have moved away from that location in recent trailer designs.
So, "here's the deal" with the way Keystone built your trailer:
The part of your response I bolded in black: You are correct, the system CAN be used on either black or gray tanks. BUT: Keystone does not install flush systems on gray tanks. In other words, "the system can but Keystone doesn't"...
The part of your response I highlighted in red: The manufacturer of the flush system designed it to be used in either black or gray tanks. It can be installed in either. Keystone only uses it in the black tanks.
The part I highlighted in blue: Yes, the manufacturer designed it for use in either black or gray tanks. Keystone elected to use it in black tanks only.
You can confirm the above by completely emptying all your RV tanks and closing ALL tank valves. Then connect your flush system to a faucet, turn on the water, open the black tank valve in the convenience center and confirm that water is flowing out of the black tank. Close the black tank valve, open the gray tank valve in the convenience center and confirm if there is any flow from the gray tank. You won't find any flow except possibly some residual gray water not previously drained. To compliment this test, you can install a clear 3" or 6" adapter to the sewer outlet to help see what's flowing through the sewer hose outlet.
IF YOU DO THIS "TEST" BE SURE THAT YOU DON'T LEAVE THE BLACK TANK VALVE CLOSED FOR TOO LONG. YOU RUN THE RISK OF RUPTURING YOUR BLACK TANK IF YOU "FORGET AND LEAVE THE HOSE RUNNING, FILL THE TANK TO OVERFULL AND PRESSURIZE IT BEYOND CAPACITY. In other words, be careful not to explode your black tank.....