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Door Lock Bathroom Toilet Door Lock with Occupancy Indicator Stainless Steel Vacant Engaged Toilet Privacy Indicator Lock Hardware Accessory : Amazon.co.uk: DIY & Tools
Twin-Pack Mutex Bathroom Door Lock Knob, Color Indicator for Vacant or Occupied in Use Restroom, Thumbturn, Emergency Unlock, Fits Standard 2 1/8" Doors : Amazon.co.uk: DIY & Tools