its a 22mm T- piece going into baxi pump. Screwed right in tight as f_ck but still dripping at pump connection. No got a big enough spanner to try and tighten a bit at connection.
Well done to all who got early ones. I got pissed of and went away with the young yins. Came home to find 3 from 4 clocked within 40 mins. Should've went tossing a t 5am