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By Pass is not a problem get a adjustable spanner & reduce flow do a bit at a time I norm fully close then open up a little bit at a time & you can adjust summer winter .

You cant change with out draining . Why not clean your system first Buy some cleaner put it in your tank then run it a month clean out the crap .then drop the system .go on screwfix buy new valves but if you can get a plumber for £20 hour get one he will do it while your thinking about it tools...

you do have a Magnaclean then your in a easy situation . Buy some more inhibitor F1 is good cal chem is OK in a week if you have old rads clean your Magnaclean then get a sponge a bowl & a cap off a spray can bail out the water in your magnaclean then sponge out the water at the bottom the cap...

you do have a Magnaclean then your in a easy situation . Buy some more inhibitor F1 is good cal chem is OK in a week if you have old rads clean your Magnaclean then get a sponge a bowl & a cap off a spray can bail out the water in your magnaclean then sponge out the water at the bottom the cap...

you do have a Magnaclean then your in a easy situation . Buy some more inhibitor F1 is good cal chem is OK in a week if you have old rads clean your Magnaclean then get a sponge a bowl & a cap off a spray can bail out the water in your magnaclean then sponge out the water at the bottom the cap...

If you have a expansion tank it as norm a flat fibre washer is expansion male or female I presume you have a standard ball valve with a compresion olive on not realy designed for the job but should do it done correctly 4 bar is high though so I have not read all story .I suggest you get a larger...

As they all say find stop cock ,if you do it may be seezed as well as its not been touched for 20 years but if not then your on your way . If not if you have about 12inch of pipe you can get at freez it you put foam jackjet on it spray in a ozone busting chemical that evaperates off fast...