Male SAE Flare to straight Solder brass union or brass adapter suitable for connecting pressure controls and pressure gauges - AliExpress
Solder Brass Fittings (metric) | Metal Fittings | NIBCO
Parker 43F-6-10 45 Degree Fitting, Flare to Solder, Brass, Flare and Solder O D Connector, 3/8" and 5/8": Amazon.com: Industrial & Scientific
JB Industries A32703 | Insco Distributing
Libra Supply 1-1/2 inch Lead Free Copper Sweat Male Union C x M (Copper + Brass) Solder Joint, (click in for more size options)1-1/2'' Copper Pressure Pipe Fitting Plumbing Supply - Walmart.com
Straight Brass union- Male SAE Flare to Male Solder adapter is used for refrigerant pipelines and oil management systems - AliExpress