Sorry to be the bearer of bad news but they don't have a flush drain. Can only empty by flushing manually until empty. Our caravan went for service and the engineer said Dometic toilets are "evil", you have to take the whole unit out to do any work on them. Must admit that we're not thrilled with ours.
------------- Jean
Sometimes a little rain must fall before you reach a rainbow.
The work will wait while you show the child the rainbow, but the rainbow won't wait while you finish the work.
We've got a Thetford C200 model toilet in our 2004 caravan and there isn't a drain for the flush tank either. However, our first caravan which was a year 1992 model did have a drain flush which was the Thetford C4 bench type toilet. If there is no drain for the flush then you just have to flush the top tank into the waste tank then empty it.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets