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Hi, I was wondering if anyone could help me to identify this type of fitting, and whether I need a special tool to remove? It is on the central heating circuit, and I think the pipework is 15mm grey Polybutylene, but despite plenty of googling I haven’t managed to find any images of fittings...

Hi all, I'm having a bit of trouble with my boiler, a Worcester 28i RSF. The hot water has been intermittently running really hot (up to 85degC) and tripping out the overheat thermostat (requiring the reset button to be pressed on the top of the boiler). This happens a up to 5 times a day at...