Black Tank Flush

[geeksrus]

When I remove the hose after flushing the black tank, clean water comes out of the connection. I then put in the rubber plug but there continues to be some leakage from the connection. Is this normal? If not, how can it be corrected?

Thanks EH!

 

[Fordsd250]

I have a 2006 3500 and it does the same thing. I think it is because you hook up a garden hose with a lot of pressure to a flush valve that has small outlet holes to cause a good spray to clean the tank. When you shut off the water and undo the hose, you have some pressure built up and it releases at disconnect.

 

[Ray LeTourneau]

My guess is it's the water remaining in the hose up to the point where the anti-siphon valve is. It just flows back out the connection. There is no check valve at the connection.