I use triggers on all my poles, I think Sureclean (Ireland) are doing a special on them, the ones I bought were bout £25 each but I wouldn't use a pole without one now, saves soo much time and you wouldn't believe the water you save, in reference to fitting them they are incredibly easy, but whichever supplier you choose to get it from will explain how to fit it. the only thing I would say is that when your pole is closed you will have a loop of pole hose which some might find annoying but now I have got used to it it's not a problem. I might not have explained everything appropriately so let me know if you won't to know more.