Ebay item no. 280595257501, £10.00 inc, free delivery(mine came 1st class post.)
I have an 18ft brodex alloy complete with their trigger(£60 odd for the trigger gun from brodex) i got when i bought my wfp gear,thankfully 2nd hand and unused and at a great price. This ebay item is the same gun but doesnt have the fittings to attach. I use my pole for gutter cleaning hooked up to customers mains pressure and having the trigger is a huge help. Anyway i have bought one of these because of the price and just thought it was a handy thing to have about for the future.
The extra fittings that come with the brodex trigger make it sit nice on the pole(inc. 2 bolts that go through the pole) but a bit of diy would have this ebay gun sat well enough,there are 2 holes to accept bolts through them in the handle, i`ve seen pics where users have clamped them on with large jubilee clips. The ends are 1/4 females ready to take a 1/4 hosetail fitting.
If you have a trigger and its well fitted to the pole it offers a good grasp point as well.
Just thought it might be worth a mention. The gun is a stuttner st601(good quality)