10pcs/bag Stainless Steel 304 High Pressure Ferrule Tube Compression Male Connector Fitting 3/8"OD X 3/8"NPT M - AliExpress
Amazon.com: HydroMist Single-Hole End Cap Misting Connector, 3/8" Compression Fitting, Made of Nickel-Plated Brass, To Be Used with 3/8 High-Pressure Nylon Hose, Requires 1000 PSI Pump : Patio, Lawn & Garden
Amazon.com: Dorman 800-205 High Pressure Compression Union Rated For 5000 PSI 3/8 In. : Automotive
High Pressure Compression Fitting Union 3/8" – 4LifetimeLines
Union Compression, High Pressure, Black Oxide Coated Steel, 3/8" – AGS Company Automotive Solutions
Stainless Steel Instrumentation Pipe Fittings - 3/8" Union Ball Joints