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I can see why you dont want to drain it now. Yeah you'll be able to get them out we use a spanner and a you'll need a big allen key to remove the one i think your taking about.
There will have been take but as you screw it into the radiator it usually comes off but will seal it.(Im guessing you talking about the tail thats in the radiator)
konastab01
stevo_com
Not a combi, unpressurized. Might go unvented in future and they'll pressure test everything then. I may see if I can get the tails out of the old rads and if they are salvageable, reuse them. If not, stump for getting my plumber to just drain the system down and fit new valves. The TRV valve bodies aren't the best anyway.