The PDQ push button locks offer a convenient way to control access between public and private areas. There are no keys or cards to manage, no computers to program, no batteries to replace, and combinations can be changed in seconds without removing the lock from the door. Pushbutton locks offer a convenient way to control access between public and private areas. There are no keys or cards to manage, no computers to program, no batteries to replace, and combinations can be changed in seconds without removing the lock from the door. This mechanical lock, with lever option, 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.