DavecUK gregE Have them install it…then ensure you add extra lubrication there is an article on flow control kits in the forum knowledge base. https://coffeetime.freeflarum.com/blog/745-lelit-flow-control-valve-and-coffee-sensor-version Oh and remind them to pack the original bits of the group they remove in the box for you (which they would probably do anyway).
Cuprajake Depending which you are looking at The bianca flow control was a much shorter throw than the coffee sensor one i installed on my minima So bare that in mind
gregE Good to know. If I have ACS do the installation it will probably be their own flow control which I am not sure how it would compare to your experiences with coffee sensor and bianca. But a lot of variables at play.