Vortens 3412 Color:White We are not positive but

We are not positive but believe the hole is used for some kind of locking mechanism

Lid P/N: 7454 or Proflo 3110

Lid P/N: LID31731N

Lid P/N: D-1

Tank Size: 23" x 8

Vortens 3412 Color:White We are not positive butManufacturer: Vortens Lid P N: 3412 or 3425 Lid Size: 17" x 8. 75" Tank P N: 3412 or 3432, SASA 3439 (RH Version) Tank Size: 16" x 8. 5" This item was also marketed under the name Lamosa Sahara and SASA. Your toilet may say Lamosa Sahara or SASA on it. Note that This lid fits both the 3412 and 3425 tanks but the tanks themselves are not interchangeable. 3412 has a 2" flush valve and 3425 has a 3" flush valve. Otherwise, the tanks are the same size.