Proline Series 5/16-in x 5/16-in Compression Coupling Union Fitting in the Brass Fittings department at

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How To Install a Compression Fitting on Copper or Plastic Tubing

Brass Fittings at Menards®

Everbilt 7/16 in. x 3/8 in. Female OD Compression Brass Reducing

LTWFITTING 5/8-Inch Brass Compression Sleeves Ferrels,Brass

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5/8-in x 3/8-in Compression Reducing Union Fitting

Proline Series 5/8-in x 3/8-in Compression Reducing Union Fitting

Do it 3/8 In. Brass Compression Insert (2-Pack)

Pipe & Fittings - The Home Depot

Brass 3/8-in COMP x 3/8-in FL Fine Thread Compression Adapter