Amazon.com: Ancable Premium 2-Pack 1/4 Inch Coupler Adapter, Heavy Duty Full Metal 6.35mm TS and TRS Female to Female Barrel, Stereo Cord Extender for Extending Guitar, Instrument, Speaker/Microphone/Patch Cables : Musical Instruments
Metal Gas Can Adapter - Add An EZ-POUR Spout To Your Metal Gas Can - Walmart.com
Luer to Luer Metal Connector
Melnor Metal Double Female Adapter 59Z FB-HD - The Home Depot