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I was once trying to flush out pipe work to a heat exchanger that was totally blocked with black sludge by connecting it to the mains with a hose.
What could go wrong?The owners were sat chatting with me in their kitchen when one connection on the hose failed.
The back pressured black sludge and water sprayed out all over me and the kitchen, leaving my negative shadow on the wall.
They stared in stunned disbelief.Fortunately they were mates and I was sort of doing them a favour.
I think they forgave me.
absurdbird
I once witnessed a plumber install an isolation valve without turning off the stopcock. That was a sight to behold.