Check the listing for details. Briggs/Case Replacement Toilet Flapper – 5173 or SP-73. Condition: New. Listed at 8.90 USD. The flapper/tank ball is responsible for keeping the water in the tank when the toilet/water closet is not in use. By actuating the tank handle the flapper/tank ball lifts up and lets the water out of the tank. The water goes into the bowl causing the bowl to flush. After the tank has been emptied the flapper/tank ball returns to its’ original position. Briggs/Case Flapper – SP-73 or 5173 Original OEM 5173 Current OEM Part Number 5173 OEM Alternate Part Number #1 SP-73 OEM Alternate Part Number #2 5172 Longer Chain OEM Alternate Part Number #3 5103 Longer Chain Alternate Part # 52P, 52 Alternate Part # 53366, 930067 This flapper is used with the Briggs flush valves listed below:5188SP-8880275093 PLEASE MAKE SURE TO CHECK WHAT PART IS IN YOUR TOILET PRESENTLY. VARIOUS FLUSH VALVES WERE PLACED IN TOILETS DURING THEIR YEARS OF PRODUCTION AND DIFFERENT FLUSH VALVES MAY TAKE DIFFERENT FLAPPERS. ******************** PLEASE CONTACT US WITH ANY QUESTIONS YOU MAY HAVE. PLEASE NOTE: These are new/unused parts...they may have age to them as they are original parts.