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(NOTE): The fittings that interface with the injector are NOT the fittings we used. These fittings were COTS fittings from McMaster that were initially had YorLok nuts on them (link), but were unscrewed. THESE FITTINGS WILL SHEAR. They were 10-32 threads, we scaled up to a custom fitting with a 1/4-32 male thread and we haven't experienced shearing when compressing the copper crush.
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