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OK it may not be actual 'Grit', but it is some kind of 'fine gritty media' that it present, to work as an abrasive and clean the joint prior to soldering. But it is this that actually causes the joint to lock up when fitting together

I am a new gas engineer (8years) and i havent come across one yet ,but is anyone familiar with Primatic Cylinders? How are they identified? I have been told that if you need to work on the heating system and drain it down, than you will certainly have problems filling the system afterwards and...

Well, first of all, when I am in the pub, I only EVER talk about ;SEX DRUGS AND ROCK'n'ROLL, but regarding a flux to use; It has to be 'LACO', these so called 'self cleaning ' products contain a 'grit' to clean the tarnish from the metal to be soldered, which obviously dissolves during the...

Thanks for your reply, I did an internet search and it led me to 'N' power. The boiler is not dissimilar to your average Gloworm spacesaver type of boiler, it has a honeywell gas valve and a duplex burner, i just cant get hold of a pilot burner assembly, so I am going to have to break the bad...

Hi I am a Gassafe installer/breakdown engineer, I was called out to a faulty boiler today, I replaced the faulty HT Lead, and the Piezzo wasnt working great either so replaced that, then realised the thermocouple wasnt holding either so I replaced that with a universal, but then found a...