5/16" Quick Connect to 1/4" NPT Fuel Hose Adapter Fitting
MH 5/16-24 – Beswick Engineering
Brass Fuel Connector, 5/16" Hose, Male (1/2-20 Inverted) – AGS Company Automotive Solutions
5/16"-24 to 1/4"-20 Polisher Buffer Backing Plate Adapter – Tool Guy Republic
AliExpress
Amazon.com: Aramox 6AN x 5/16-24 Adapter, 6AN x 5/16-24 O Ring Spittier/Return Port Fit for Ford Hydroboost
5/16" OE Fuel Line Port Adapter
LTWFITTING 5/16 in. O.D. Comp x 1/4 in. MIP Brass Compression Adapter Fitting (5-Pack) HF685405 - The Home Depot
LTWFITTING 5/16 in. O.D. Comp x 3/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF685605 - The Home Depot
Parker - Industrial Pipe Adapter: 1-5/16-12 x 1" Male Thread, Male Straight Thread O-Ring x Male NPTF - 72519150 - MSC Industrial Supply
5/16" Flare x 3/8" Male Brass Adapter - Warren Pipe and Supply
Puller Adapter 5/8-18 Female To 5/16-18 Male
Adapter Fittings 1/4 NPT to 5/16 2pk | Allstar Performance
Uxcell 5/16 SAE Flare Male to 1/4NPT Female Tubing Adaptor Brass Pipe Fitting - Walmart.com
LTWFITTING 5/16 in. Flare x 1/2 in. MIP Brass Adapter Fitting (5-Pack) HF485805 - The Home Depot
1pc Brass R410a Adapter Connectors 1/4" Male To 5/16" Sae Female Charging Hose To Vacuum Pump For Air Conditioners Mayitr - Pneumatic Parts - AliExpress
Amazon.com: 6AN Male to 5/16 Tubing Adapter Aluminum AN 6 Flare to 5/16 Hard Line Tube Fittings Black Anodized : Everything Else
Hillman 6-Pack 5/16-in x 1/4-in Threaded Coupling Adapter Fitting in the Brass Fittings department at Lowes.com