BRAKE LINE ADAPTER FOR MASTER CYLINDER 9/16 18 male X 3/8 24 female 3/16" line | eBay
Solid Brass Pipe Fitting Adapter, Female 1/2" to Male 9/16" Copper Bathroom Faucet Water Supply Line Coupling with Seal O Rings|Pipe Fittings| - AliExpress
Amazon.com : IST Hose Adaptor 9/16" male to 3/8" : Garden Hose Parts : Sports & Outdoors
Brass Adapter, Female(3/8-24 Inverted), Male(9/16-20 Inverted) - AGS Company
9/16-18 FORB x 3/8" MNPT Female O-Ring to Male Pipe Adapter Steel Hydraulic Fitting
Parker - 9/16-18 x 3/8 Male Thread, Zinc Plated Steel Industrial Pipe Adapter - 72519184 - MSC Industrial Supply