Danco Dual Standard Adapter in the Faucet Aerators department at Lowes.com
Orbit 1/2 in. Drip-Lock Hose Faucet Adapter 67495 - The Home Depot
2 1/2" PVC IPS Gasket Joint Spigot Adapter (G x Spigot) - The Drainage Source
Faucet Angle Adapter - DripWorks
Amazon.com : Neewer 2 Pieces Standard 1/4 to 3/8 inch Metal Male Convertor Threaded Screw Adapter Spigot Stud for Studio Light Stand, Hotshoe/Coldshoe Adapter, Ball Head, Wireless Flash Receiver, Trigger : Electronics