Amazon.com: FLYWTR Faucet Coupling Nut, 63/50 Inch 32 MM Quick Tighten & Release Lock Nut, One Hole Faucet Shanks Fixing Accessory, Fastener for Attaching to Faucet Shanks from Underneath the Counter :
Fluidmaster 3/8 in. Compression x 3/8 in. Compression x 16 in. L Braided Stainless Steel Faucet Connector B6F16 - The Home Depot
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Y32016 Plastic 1' Tap Adaptor Faucet Connector for Garden Hose - China Hose Accesorries and Water Hose Quick Connrctor price | Made-in-China.com
BrassCraft 3/8 in. Compression x 1/2 in. FIP x 30 in. Braided Polymer Faucet Supply Line B1-30A F - The Home Depot
Adapter To Connect Faucet & Quick Disconnect with Coupling Nut - HBYOB "Home Brew Your Own Beer"
Replacement Faucet Coupling Nut
3/4'' Inch Garden Hose Shut Off Valve Water Pipe Faucet Connector Handy | eBay