Scuba Adapter - 1/4 NPT Male to 9/16 Scuba Adapter Male – BRASS - AXSUB® Commercial Diving Supplies
9/16-18 Male x 1/2-20 Female Inverted Flare - Hi-Line Inc.
Amazon.com: AC PERFORMANCE Aluminum 6AN AN6 Flare to 1/2 NPT Male Hose Fitting Adapter Union Fuel Oil Line Pipe Connector, JIC 6AN 9/16-18 Male Flare to 1/2" NPT Male Thread Black Anodized :