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Called out to a mixer bath tap, been dripping for some time, owner had new cartridges that needed fitting. Put new cartridges on, but taps still leaking, so I took old ones home and put into an old tap and pressure tested to 3 bar, no leaks. Took back to house and replaced the new hot with an old one, leak stopped. I then took the new one home and did same pressure test, no leak. I can only surmise that the greater pressure has forced the rubber bung and discs tighter into cartridge body, does any one have any thoughts on this?
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