1/4" MNPT x female 1/4" inverted flare adapter - propanegear
PARKER Adapter: For 3/8 in x 3/8 in Tube OD, Flared x Solder, 1 5/32 in Overall Lg, 10 PK - 1VDV2|43F-6-6 - Grainger
1/2" OD Flare x 1/2" MIP Adapter Gas Fitting (Tapped 3/8" FIP) | Supply Smart
Amazon.com: 4 Pieces 6015 R134A Brass Refrigerant Tank Adapter to R12 Fitting Adapter 1/2 Female Acme to 1/4 Male Flare Adaptor Valve Core and 6014 Vacuum Pump Adapter 1/4 Inch Flare Female
LTWFITTING 3/4 in. OD Flare x 1/2 in. FIP Brass Adapter Fitting (5-Pack) HF4612805 - The Home Depot
Everbilt 3/8 in. Flare Brass Coupling Fitting 801529 - The Home Depot
2pcs Brass Tube Fitting Sae 45 Degree Flare Adapter 1/4" 5/16" 3/8" 1/2" Sae Male X 1/4" Npt Male Quick Connector - Pipe Fittings - AliExpress
BrassCraft 3/8-in x 1/4-in Threaded Flare x Mip Adapter Fitting in the Brass Fittings department at Lowes.com
Dormont 90-3031R Gas Adapter Fitting 5/8-Inch OD Flare by 1/2-Inch Male, Brass flare adapter for use with 5/8 inch OD gas range connectors By Watts - Walmart.com
Port Adapter - 1/2 x 5/8 Female Flare x Flare Adapter w/ Copper Gasket - UR3-810 | HVACDirect.com
US5-4 - Flare Adapter US5 | Hydradyne LLC
Swivel Female Flare x Solder Adapter - JB Industries
1/2" NPT Male to 1/4" MFL Male Flare Adapter
Flare Fittings
ProLine 3/8-in x 1/2-in Threaded Flare x Mip Adapter Union Fitting in the Brass Fittings department at Lowes.com