Kno alot on here would say waste of time. But personally I swear by them. I put a pouch on with belt. Hanging on belt is 2 holsters, with stud fasteners.
I work residential, and have rows of houses on both sides of road, so im not in and out van all day! So I run hose thru holster and use a switch valve. Advantage no snagging n unclipping any fasteners. No tripping over hose as It's kept behind you. In pouch keep a rag, so pperiodically can wipe pole hose so not dragging sludge up into poles. Also a very quick way to turn water off, freeing hands to adjust pole lengths without wasting water. Compared to pinching pipe