9/16-18 Male x 3/8-24 Female Inverted Flare Master Cylinder Brake Line Adapter | eBay
Neoperl 30 0500 8 3/8" PCA Compression Fitting Supply Line Adapter, Male 9/ 16"-24 UNEF x Female 9/16"-24 UNEF, 1 GPM Maximum Flow Rate, Nickel Plated, Blue Flow Regulator (Pack of 6): Amazon.com: Industrial & Scientific
J Harlen Co. - Fairmont 3/8" x 9/16" Swivel Adapter
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
FAV 9/16″ HP X 3/8″ Type M Adapter | Autoclave Fittings Adapters
T&S 006101-45 Fitting Adapter with 3/8-18 NPT and 9/16-24 UN Male Connections
Sonar LP 9/16-in Male x 3/8-in Female Regulator Hose Connector - The Scuba Doctor Dive Shop