[BB_TX]

Ken - Those black tank flush anti siphon vacuum breaker valves have a long history of leaking, often to the point of flooding your trailer. Many have simply removed them and connected the lines directly together, and use an external anti siphon valve. Some don't even use an external valve. The chance of dirty water being siphoned back into the public water supply is very remote in this case, but remote does not mean impossible.

Some have replaced the valve with a better quality brass valve.


MikenDebbie - I would think if you have two black tanks each having a flush connection that there would be two of those valves. One valve could not service both flush lines since each has its own connection.