Universal E61 Upper Grouphead Injector Sleeve With O'ring - 4822135900  £33.48

Seemingly Identical to the one which came on my Izzo Alex Duetto, and many others. Machining quality not a work of art, but as good as the original. I wish they'd sell a stainless version, as the chrome wears off of the internal parts of these over time. Nevertheless, this cost less than half of the price charged by other suppliers and is just as good.