Be careful with that part.
If the piping for your black tank doesn't come straight out of the tank directly to the dump valve, then it won't work. Take a look under your trailer, if there are any curves in the pipe then the water stream from that will be useless - I bought one some years ago and it was a waste of time.
Oh, and if you piping is ok do not use that part for both tanks - they need to be separated at all times, and that includes flushing.
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