Well obviously I haad lowered the water level so it did not leak and with part of the edge drilled away it reduced the pressure on the cylinder thread and enabled it to rotate and be removed.
Just my luck then. I’ve never removed one before. All ready to try to get it out and hoping I am not going to break the tank and none of the standard immersion spanners fit.
Well, I had to give up on this one. Got a plumber to help. He went straight for the box spanner which didn’t quite fit no matter how many times he tried. He had another immersion spanner which also didn’t quite fit. He did seem a bit suprised. His wrench wouldn’t quite open enough for 86mm but I had one handy that would. Not easy to hold it on the nut with all the insulation but after some force and a hammer we got it out without any leaks that I can see. I think I’ll replace it regularly to save the hassle.
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