This steel adapter makes it easy to connect your OEM hard lines to aircraft-type plumbing. One end has a standard 6AN (9/16-18, 37° flare) male JIC
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SAE J512 45 Deg Inverted Flare Fittings Dimension Chart, 41% OFF
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Earl's hardline Adapter, 5/8-18 Inverted Flare Male to 1/2-20 Inverted Flare Female for 5/16 : Sports & Outdoors