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

3/8OD X 3/8MPT Brass Compression X Male Pipe Thread Straight Connector — COPPERTUBINGSALES

O.D. tube size. 1 per card. Manufactured to include no more than 0.25% weighted average lead content on wetted surfaces.

Do it 1/2 In. OD x 3/8 In. OD Brass Compression Reducing Union

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

Brass Compression Fittings for Potable Drinking Water

Everbilt 3/4 in. FIP Brass Union 80532 - The Home Depot

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

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

Tube Size:1/2 OD x 3/8 OD Package Content : 25 PCS(Include Nut And Ferrule) Materies: BRASS, Net Weight: 22g/PC Choosing products dimensions and

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