John Guest 3/8 Stem to 1/2 Hose Barb - Join 1/2 silicone tube

John Guest 3/8 in. x 1/2 in. Push-to-Connect Tube to Hose Stem Fitting (10-Pack) PP251216W - The Home Depot

10mm x 15mm Speedfit Stem Elbow - PEM221015W - On-Demand Supplies

John Guest Stem Barb Connector - 3/8 OD Stem x 1/2 ID Barb – Fresh Water Systems

Barbed Fittings

John Guest Tube to Hose Stem 3/8 inch Stem x 3/8 Hose (one supplied) : : DIY & Tools

JoyTube Plastic Hose Barb Fittings 3/8 Barb X 1/2 NPT Male Thread Adapter Connector Pipe Fittings (pack of 6), Pipe Fittings - Canada

John Guest Stem Barb Connector - 1/4 OD Stem x 3/16 ID Barb

John Guest 1/2 in. OD x 3/8 in. Push-To-Connect Reducing Union Fitting (10-Pack) PP201612W - The Home Depot

Brands — American Copper & Brass

John Guest 12mm Bulkhead Connector - The Caravan Accessory Store

Holiday House Distributing

Draft Beer Fittings and Connectors for Your Kegerator or Beer Tower —