Fit Cuffs – Fit Manometer is a combined pump and pressure gauge (mmHg). Fit Cuffs is a state-of-the-art Training System exclusively developed for Blood Flow Restriction (BFR) Exercise. Fit Cuffs works by inflating solid yet pliable cuffs by means of this solid pressure gauge and a solid metal quick-disconnector. It works on both Arm and Leg cuffs). One-Size-Fits-All.