Tank - Briggs 4930 or 4920 Color:Elegant Black Lid Part Number: #15

Lid Part Number:   #15

28 GPF with the same part number stamped inside the tank

Tank Part Number:  123 or 386

Lid P/N: 5561

The part number for the button that fits the larger hole is 1265519

Tank - Briggs 4930 or 4920 Color:Elegant Black Lid Part Number: #15Manufacturer: Briggs Tank P N: 4930 or 4920 Rough In: 12" Bolt Width: 5. 5" Flush Valve Diameter: 2. 5" Gallons per Flush: 1. 6 or 3. 5 Internal parts and Briggs 7421 tank lid available separately. Why 1. 6 or 3. 5 GPF? Briggs made this originally as a 3. 5 gallon per flush toilet, and then during the changeover to 1. 6, they kept the porcelain the same and just changed out the internal parts to restrict the amount of water that would fill up in the