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A yellow tape measure is shown inside a white toilet tank, measuring the distance from the rim to the bottom. A red arrow points to the measurement, and a toilet is partially visible in the background.

How to determine if the Nashmor module will fit in your 1.6 GPF Toilet tank

  • Carefully remove the tank lid, gently place it aside.
  • Look at the inside back wall for the size 1.6 GPF stamped into the ceramic.
  • Is there a minimum 3" wide space available on the right side of the center drain flap?
  • Is the front to back measurement 6.5" or 7" as shown in the photo?
  • If the last 2 answers were YES, the Nashmor module can fit your tank

Install your Module in 1 Minute

  • Remove tank lid
  • Shut off water at the supply valve
  • Flush the toilet handle to empty most of the water in the tank
  • Determine which module length, 6.5" or 7", is required. Align it to match the opening
  • Place the module on the right side of the flapper area, keeping at least 1 inch of clearance from the flapper
  • Push module down to the bottom of toilet tank until it stops
  • Turn water back on, wait for the tank to fill
  • Flush handle, check for any interference with tank flap, adjust module if necessary.

How to remove the center plug