Get the 3/8" Brass Flare Union Coupling at your local Home Hardware store. View online and pick-up in store.
3/8 Brass Compression Cap : : Tools & Home Improvement
U3-8C JB Industries 1/2 x 3/8 Flare x Female Pipe Adapter 5 Qty Box
Dominion: 3/8 Brass Flare Union Coupling :: Brantford Home Hardware
1/4 Brass Flare Union Coupling : Industrial & Scientific
Pneumatic & Hydraulic - Fittings - Page 1 - Industrial Automation Canada
1/4 Brass Flare Union Coupling : Industrial & Scientific
LTWFITTING 3/8 in. OD x 5/16 in. OD Flare Brass Reducing Coupling Fitting (5-Pack) HF42R6505 - The Home Depot
LTWFITTING 3/8 in. OD x 5/16 in. OD Flare Brass Reducing Coupling Fitting (5-Pack) HF42R6505 - The Home Depot
1/2 x 3/8 Brass Flare Union : : Everything Else
Dominion Flare Elbow 45° Forged-tube To Male Pipe, 1/2 x 3/8 - Each (DF54-8C)