I'm still never used one a simple pinch of hose works, I've not seen anyone in my area of Hertfordshire as I would as to borrow it to see if there worth it, but I'm simple pinch hose I've got remote control of freedom trolley I've even managed to fit and hide one in surfow backpack i hade a spare to apply to my van but never got around to it as i can't find it or lost it or lent it out ive lent permeate pump out for trials to see if bigger version could be a goal for my filter are 20in housings from Alex way back, I've never hard results on permeate pump or know where it went as I could have lent it as my mate is stuck but I don't like chasing things, but would be hopeful of possibilities of bigger version being made, one day I'll come across uni valve as I'm one to like to see if anything can be improved on otherwise it's works straight out the box, I've seen few variations on the same idea just forgot about them till I see post,