Do it Best 1/2 in. Nom Copper x 3/8 in. OD Union

Straight connector. 1/2 nominal 5/8 O.D. copper compression to 3/8 O.D. tube.
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1/2 Male Flare x 3/8 Male Pipe Thread - propanegear

Everbilt 1/2 in. x 3/8 in. Copper Pressure Cup x FIP Female Adapter Fitting C603HD1238 - The Home Depot

68X2 by Danfoss, Compression Fitting, Male Connector

Tube Size:3/8 OD Net Weight: 34.7g/PC Choosing products dimensions and quantities at column of size and colour seperately,price would be more

LTWFITTING 3/8-Inch OD Compression Union,Brass Compression Fitting(Pack of 10)

Proline Series 3/8-in x 1/2-in Compression Adapter Fitting in the Brass Fittings department at

Ideal for high pressure applications up to 5,000 PSI Suitable for a wide range of industrial and HD applications Black oxide coated for superior

4LIFETIMELINES 3/8 High Pressure Compression Fitting Union up to 5,000 PSI - Black Oxide Coated Steel - 1 per Bag

Brass Compression Fittings for Potable Drinking Water

5/8-in x 1/2-in Compression Coupling Fitting

Proline Series 5/8-in x 1/2-in Compression Coupling Fitting

Proline Series 1/2-in x 1/2-in Compression Coupling Union Fitting in the Brass Fittings department at

Everbilt 1/2 in. Copper Pressure Cup x Cup Union Fitting C633WHD12 - The Home Depot

LTWFITTING 1/2 in. O.D. Comp x 1/2 in. MIP Brass Compression Adapter Fitting (20-Pack) HF688820 - The Home Depot

Ice Maker Water Line Brass Tube Fitting, 3/8 Male x 1/4 Compression - (2 Pack)

1/2 FIP X 3/8 COMP LF ANG BALL STOP LF - 76690 - Best Plumbing Specialties