The push fit inline flow control valve works well for some wfp users.
Here is Alex Gardiner's video
https://www.youtube.com/watch?v=cS51l4oY2mgThe tap can take a hammering in day to day use. Sometimes it fails when the hose pulls out of the valve and damages the 'teeth' that hold the hose in place.
This modification can help the tap last longer. Use a 10 inch stainless steel blade as the 'backing plate' and double up the duct tape on each end.
The duct tape needs replacing weekly. I do it at the same time as rinsing out the inside of the pole and just slice off the old duct tape with a stanley knife.