The Plumber's Choice 3/8 in. Flare x 1/2 in. Brass FIP Gas Ball Valve LxFGAS3812 - The Home Depot
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Mini 3/8" x 3/8" Male to Female NPT Ball Valve WOG 200 PSI – compressor-source
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Amazon.com: Antrader Forged Brass Ball Valve Y Shaped Shut Off Switch, 3/8" x 3/8" x 3/8" Barb Tee Pipe Tubing Fitting Coupler, with 2 Operation Switchs : Industrial & Scientific