This is great and much simpler and more compact than a bunch of tees.
What's not clear from the pictures or the documentation (either here or on JG's website) is that the stem end is sealed. I'd naively assumed the stem was open so you can pass water from one end to the other. The stem does fit perfectly into a 22mm fitting and a plumber friend says you can cut the end off, but I don't know if that's recommended/supported by JG.
