Aquasource A0098923 Version 1 Color:White the tanks are the same

the tanks are the same size

This lid is very often confused with American Standard 735007 (4078) because the 7 in 4078 and 2 in 4028 look very similar when stamped on the inside of the tank or the underside of the lid

Tank P/N: 4021

Lid P/N: 51

Sometimes people mistakenly think it is stamped 6S-7S

Aquasource A0098923 Version 1 Color:White the tanks are the sameManufacturer: AQUASOURCE Lid P N: A 0098923 Lid Size: 18. 5" x 8. 25" Tank P N: A 0012293 Tank Size: 17. 625" x 7. 5" Toilet Model: Sometimes marked Project Source or Aquasource A0312795 or Proflo PF9112 Note: There are 2 versions of this tank lid. They are generally not interchangeable. Review the measurements of Version 1 and 2 to ensure you are ordering the correct item.