1. Wear-free, small size, no noise, not easy jam, long working life 2. Move smoothly, avoid water hammer 3. Large flow design AC24V-AC220V Electric Check ValveFeatures:Wear-free, small size, no noise, not easy jam, long working lifeMove smoothly, avoid water hammerLarge flow designNever outleakageNever wear AC24V-AC220V Electric Check Valve