This LTWFITTING Compression tube fitting is made of brass for durable. And it connects to tubing on one end and has an NPT male connector on the
Plumbing, Brass Compression Fittings
LTWFITTING Brass 7/8-Inch OD x 3/4-Inch Female NPT Compression
3/16" - Pipe & Fittings - Plumbing - The Home Depot
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5 16 Compression Fitting
LTWFITTING 5/16 in. Flare x 1/4 in. MIP Brass Adapter Fitting (5
LTWFITTING 3/16 in. I.D. Hose Barb x 1/8 in. FIP Lead Free Brass Adapter Fitting (5-Pack) HFLF39153205 - The Home Depot
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5/16 In. O.D. Comp X 3/8 In. MIP Brass Compression Adapter Fitting
5/16 Compression x 1/8 MIP Brass Adapter - Warren Pipe and Supply