They are a horse of a compressor, the thread size if you want to know,
is 12mm x 1.25 pitch its not a BSP etc. Some others have made up a
a connector using two parts
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My mate with the OKA regularly bakes bread in a bread maker, does it during the day whilst the sun is shining, once his batteries are fully recharged, to use the excess solar.
He has 600W solar, 460Ah of AGM batteries & a 1300W PSW inverter,