The Simplex 3000 mechanical pushbutton lock provides exterior access by combination for narrow stile aluminum glass doors. This fully mechanical lock eliminates the material and labor expense of battery replacements, has a single access-code and is programmed via the keypad without removing the lock from the door. Fully mechanical lock eliminates the material and labor expense of battery replacements. Single access code, one easy-to-manage code for all users. Lock is easily programmed via keypad without removing lock from the door. Non-handed; required drive assembly is factory-handed, not field reversible. Passage, allows access without using the lock entry code. Feature activated from the outside using cylinder override key. Lockout, disables the lock so that entry code cannot be used to gain access. Access is permitted using the key override only. This is activated from the outside using the cylinder override key.