Black Tank Vacuum Breaker
A few days ago y'all gave me ideas about why my black tank won't flush. One of the ideas was a vacuum breaker problem. Does the thing in this photo look like a vacuum breaker? How does one ...
Forum Discussion
Old-Biscuit wrote:
Well that IS a black tank 'anti-siphon vacuum breaker backflow device' installed on the water supply line for the black tank flush system
With hose connected to flush system water comes in up thru bottom hose and LIFTS that disc up which then seals off that top cap which is open to atmosphere and then pushes spring-loaded check valve open so water flows out and down the hose on left side
Being CLEAR you can see what does/doesn't move when water supply is turned on.
BUT usually when they fail water blows out top cap and leaks inside RV
IF water doesn't flow it is usually due to the nozzle being clogged.
Thanks for the good description -- gives me things to check when I get where I can hook up to water, probably this weekend. Thanks again.
