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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LTWFITTING 1/2-Inch OD x 3/8-Inch OD Compression Reducing Union,Brass Compression Fitting(Pack of 25) - Compression Fitting Ferrules

3/8 OD Compression (Lead-Free) Brass 90-degree Elbow Fitting - Simpson Advanced Chiropractic & Medical Center

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

JUWO 1/2 x 3/8 OD Compression Straight Stop Valve for PEX, Copper, CPVC Pipe and Water Line, Push to Connect Brass Plumbing Fitting, Quarter-Turn Shut Off Valve (1 Pack)

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

Do it Best, 5/8 OD(1/2 Nom. Copper)Inlet, 3/8 OD Outlet, Straight Conn.426113

The 1/2 in. x 3/8 in. lead-free wrot copper solder pressure female adapter is used in residential and commercial systems such as potable water, air

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)

Everbilt 1/2 in. Copper Pressure Cup x MIP Male Adapter Fitting C604HD12 - The Home Depot