John Guest 3/8-in x 1/4-in Push-to-Connect Faucet Connector (10-Pack) in the Push to Connect Fittings department at Lowes.com
Melnor Faucet Adapter 2MQC - The Home Depot
1/2 to 3/8 Reducer Faucet Adapter - Compression Brass Pipe Fitting, 3/8 Male to 1/2 Male Supply Line Adapter for RV Kitchen Plumbing, Water Hose Pipe Connector with Rubber Washer, (2 Pack) - Amazon.com
gotonovo Faucet Fittings Nipple Locknut Kit Extension Threaded Pipe Lo
Faucet Connector for the Lavario Portable Manual Washing Machine – Lavario Portable Clothes Washer
Amazon.com: Faucet Adapter Kit, Swivel Aerator Adapter to Connect Garden Hose - Multi-Thread Kitchen Sink Faucet Adapter, 3/4 Inch Garden Hose Adapter for Male to Male and Female to Male - Chrome
Fluidmaster Click Seal 16 in. Universal Faucet Connector 4F16UCSR - The Home Depot