http://gardinerpolesystems.co.uk/all-products/pump-hose/hose-fittings-adapters/flow-control-valves/push-fit-8mm-stem-to-5mm-barb.htmlIf you ring them up they will alter normal postage fee for such small items. They work well.
If you get the Exceed tubeless conversion with univalve it does away with the need for the tap in your hand. What you do is take top pole section out. Fix in the Exceed pole hose,univalve and rectus fitting in that section. When you put pole back together you have the rectus fitting just inside the base of the pole. The rest of the Exceed pole hose connects to your hose reel pipe with plastic barbed adapter which you permanently fix with 'o' clips with female rectus on the end and the Exceed cover for protecting the fitting.
So then you come to first job, unwind hose reel , connect hose to bottom of pole, extend, pull on hose for flow, pull again to turn off. When job finished, back to van, disconnect, pole in van, reel in. Off you go.
BTW, on gardiner website it tells you how to make your own tubeless set-up using JG fitting and rectus fitting. Cheaper. It's not everyone's cup of tea, but imo, I think it's the best and tidiest system I've used since I started wfp. Especially when used with the univalve.