Breezliy 1/2 Inch Male Flare x 1/2 Inch Male Flare Connector Gas Adapter Union BrassTube Coupler Pipe Flare Fitting (2PCS): Amazon.com: Industrial & Scientific
Brass Flare Fittings
42F-5 - Brass 45° Flare Fittings | Parker NA
1/4" Male Flare Access Fitting with 1/4" Copper Tube Extension -BesTech - BT8404 | eBay
flare vs compression fittings - QC Hydraulics
MPT Flare Connection and Flare Fitting Adapter - JB Industries