It is fiddly, but not too bad. Turn tap off at the drain tap, so the tank does not drain everywhere when you dismantle tap. Fill up the holding tank with water, if not already full - this gives a good gush to clear things out when you do clear the blockage. Park over a drain or similar - hard to stop the flow once you clear it.
Remove the side cover, around the tap, L H side of cupboard under cooker. If I remember rightly, Tx screws on my van.
Remove the pipe forming the overflow from the top of the holding tap - remove it from the 'down' side of the tap junction. The joints are hard to undo the first time you do it, easier subsequent times!!
Find a way of blocking off the now exposed union / connector (not sure of the technical term) that leads up to the overflow. A helper's finger?? I put a Hx key from a socket set in and secured it with tape, as I was on my own. The point of doing this is to ensure that all your air is directed up through the blocked tap.
Open the drain tap. Make sure the helper has finger firmly over the overflow pipe AT THE TAP, not at the bottom of the pipe. I then blew up the drain pipe with a lungful of air - and get out of the way!! The blockage cleared immediately with no problem.
Reassemble, and relax in a self-satisfied glow.
The above is as I remember from the last time I had to do it, about 3 years ago. The tap has blocked twice in the 6 years we have had the van. I have now got into the habit of giving the waste tank a good flush through with fresh water 2 - 3 times a year, filling the sink with a bucket, and no problems for last 2 years.
lewis
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