Anti siphon valve for black tank flush
2012 FR Surveyor SV264RK. Can't seem to locate anti-siphon valve for black tank flush. I know what it looks like but it is not under sink in bathroom. When I use BT Flush I get water running from b...
Forum Discussion
Cummins12V98 wrote:dougrainer wrote:
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They are installed to prevent holding tank ODOR from venting out the inlet fitting. Most BT flush inlets do NOT have a check valve like the City Water inlet because of the inside Check valve. If the OP's is NOT factory installed, then there is no upper Check Valve. The INLET and the inlet to the tank has a check valve, that comes with the aftermarket BT kit. Doug
They are check valves on the grey and black tank flush lines. They are there to keep contaminated water from siphoning into the public water supply.
Holding tanks vent thru the roof!
^^^^^^ This ^^^^^^
There are there for the same reason codes require anti siphon valves on outdoor water connections such as outdoor faucets and lawn sprinkler systems. There to prevent siphoning contaminated water back into the public water.
