Mustang Brake Line Adapter Fitting (79-93) - LMR.com
Inline Faucet Supply Line Adapter Restrictor, 3/8" PCA Compression Fitting, .5 GPM by NEOPERL
Amazon.com: Headset Buddy Line-Level Audio Adapter with Built in Attenuation for iPhone, Smartphones, Soundboards and Mixers (iPhone-Mic-Line) : Electronics