Shut Off Ball valve [on/off] 1/4" Inline Tube tap shut off Ball Valve Quick Fitting Connection ProOne RO Water Filter Reverse Osmosis System. 100% Superior Quality Food Grade Virgin ABS Plastic Inline Tube tap shut off Ball Valve Connector for All Kind of RO Water Purifiters. Easy To Install and Replace and can be Installed by yourself, no need for Expensive Expert Technician or Ro Enginner.