alexgab Then the fitting needs removing from the boiler, take the level probe out first, just loosen the small nut (it won’t be tight), then slide it out, when replacing, don’t do the little nut too tight. Remove the main fitting from the boiler, clean threads, wrap with 7-10 turns of PTFE tape and refit.
The fitting will be really tight and you will have to shock it of with sharp raps to loosed the permanent thread lock. Be sure to tell ACS if it’s super hard to get off. I asked them to use semi permanent flexible thread lock middle of last year and I think by Last October (22), they have moved to that and/or PTFE tape.
