Roger Mills wrote:

You should be able to do it ok. Bung up the fill and vent pipes and turn
off the pump isolating valve. Put old towels anywhere where water may
drip. Then break the connection between pump and valve, and be prepared
to collect some water (shouldn't be too much) from the bottom of the
valve. Make sure that the valve is in the mid position so that you will
get everything that wants to come from both sides.

When it stops running, undo the other connections and remove the valve.

Can beat towels - Wet & Dry Vac. Brilliant for removing water from
pipes, rads, etc.

Having thought a bit more, there's not going to be much to deal with as
the valve is, bar the header tank, nearly the highest point of the
system. So a few pipefulls of water and we'll be home free!

--
Scott

Where are we going and why am I in this handbasket?