model g replacement

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The 25 series devices was designed to replace the 18 series & will completely cover existing door prep from a 18 series device. However, some door re-prep is required for the current 25 de...
The G-Series lockset was discontinued in 1981, and all service parts for the G-Series lock were discontinued in 1985. 
 The current interconnect lock, S200 series (available in levers only), will not fit into the same door preparation.
         
  The Legacy wall mounted readers are replaced as shown in the table below:  The MTMS15 and MTMSK15 did not have any prior models that it replaced.
The only spring size available is a size 4 (2314ME, 4314ME, 4414ME) which has a stronger spring to help insure that the door will close in a fire situation.