ive just tried with my old 8mil and its sooo good, i think as long as the outside diameter is sensible although a bit heavier ( i leave in the van) the flow from the vyair 7lt through 8mil is beautiful i am aiming to do a lot of the rinsing in the same sweep of the brush as the scrubbing with fan jets so i shouldnt use too much more water as i will be working a lot quicker with so much water on the glass, i carry 650 liters and always come home with at least 100