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challenger extreme DW-1840BV?

When I put any attachment on the end of the gun it fits ok, but when the pressure starts, water comes out of the connection. There may be some kind of clip missing.
A Wilkins, February 2012
on the lance insert there is a rubber o ring just replace it you can get them at b&q orany plumbing central heating outlet

ian, April 2012
Clip, 'O' ring maybe

SD, February 2012