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Typical of a condensate drain, I'd be surprised if you can't trace the thing back inside and see where it connects (run something stiff-but-flexible up the pipe and listen inside if not otherwise obvious.) Might be from an A/C unit, a condensing furnace or hot water heater, etc. In freezing climates safety overflows are normally prohibited from a placement ...


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A pipe like this is often a safety overflow from a central heating boiler. I had the same problem, dripping cold water from a pipe like that in a new built house. It was eventually traced to a wrongly fitted safety valve on the expansion tank beside the gas boiler. I was told by the plumber that, if left, the heating pump would eventually fail. After ...


2

If you only notice it draining when the air conditioning cooling unit is on, my guess would be it is the condensate drain for the evaporator coil.


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The US uses 3/4" straight thread, with 11.5 threads per inch according to Wikipedia


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In the U.S. the standard is simply called Garden Hose Thread or GHT,. It's a 3/4" straight thread with a coarse thread pitch and is not compatible with the BSP which is a finer thread pitch.


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If this is PVC, 3/4' will slip inside 1" Class 200. The class 200 has a thinner wall, so is larger inside.



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