On 30 Mar 2005 03:12:33 -0800, "Magician"
wrote:

The Wanderer wrote;

It's
invariably a smallish bit of grit in the outlet lance, keeps blocking
the
nozzle. Bit of a pig to clean out

Best done with an airline IMO. Try not to poke things into the nozzle,
the size is crucial. We use 6 different sizes of nozzle and the
difference between the biggest and the smallest is 0.5mm.

Dave

[op]: thanks for all your helpful replies. It looks like it's worth
saving.
I think I'll start with the dump valve - it looks favourite for me
Gelf