This LTWFITTING flare elbow fitting is made of brass for durable. 45° Flare connection on one end and an NPT female connection on the other. And it is
Gas Brass Flare Fittings
LTWFITTING Brass Flare 5/8 OD x 3/8 Male NPT Connector Tube Fitting (Pack of 5)
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LTWFITTING 5/8 in. Flare x 1/2 in. FIP Brass 90-Degree Flare Elbow Fitting (5-Pack) HF5010805 - The Home Depot
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5/8 Flare X 5/8 Flare 90 Degree Brass Union Elbow, 55-10