Hibbent Non Electric Toilet Bidet Seat - American Round Toilet Seats - No Electricity Bathroom Bidets Dual Nozzles Sprayer for Bidets and Rear Washing(Fitted 16.5-18 inch Round/Standard Bowl)-OB108 Round/Standard Toilet Seat with Bidets, No batteries or Electrical power need, safe using bidet seats SEPARATE nozzles for feminine and rear cleansing & Soft Close seat! AMBIENT temperature for refreshing wash & Modern sleek design Comes with all accessories parts for convenient installation. Simple 15-45 minute installation or less. Fitted 16.5 -18 inch from back screw to front of Round/Standard Bowl toilet bowl(checking your toilet bowl size following the picture offered before ordering)