This plumbing pipe coupling is lead free and made of durable, corrosion resistant brass. It's used to connect 2 lengths of pipe either of the same
1/2 in. x 3/8 in. FIP Brass Reducing Coupling Fitting
How to convert quick connect from 3/8 to 1/2 - natural gas line : r/Plumbing
Everbilt 1/2 in. OD Compression x 3/8 in. MIP Brass Adapter
3/8 in. OD Comp x 1/2 in. FIP Brass Compression Adapter Fitting (5-Pack)
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Everbilt 3/8 in. Comp x 1/2 in. MIP Brass Adapter 804599 - The
LTWFITTING 5/8 in. O.D. Comp Brass Compression Tee Fitting (3-Pack) HF641003 - The Home Depot
How to convert quick connect from 3/8 to 1/2 - natural gas line
LTWFITTING 3/8 in. ID Hose Barb x 1/2 in. FIP Lead Free Brass
Everbilt 3/8 in. O.D. Compression x 1/2 in. MIP 90-Degree Brass Elbow Adapter Fitting 800679 - The Home Depot
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Sioux Chief 3/8 Compression Adapter X 1/2 inch MIP Lead Free