Thumbturn bolt with occupancy indicator

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The replacement for the D871 is the D271.  None of the parts are backwards compatible. D271 description:Thumbturn x Occupancy Indicator Deadbolt thrown or retracted by turn unit only.  Occupancy...
Door bolt occupancy indicator - Deadbolt thrown or retracted by thumbturn inside. Outside indicator displays “In use” or “Vacant”.
The Falcon MA mortise lock is available with an occupancy indicator on the following functions: MA301, MA311, MA321, MA371, MA431, MA441(inside of door only), MA451, MA541, MA57...
Related solution: Is the MA indicator available separately? 
Indicator not extended Indicator extended
The indicator on a cylindrical hotel lock is a small pin that projects outward from the face of the cylinder plug (Figure 1) when the inside push button is depressed.  When this pin is pr...
The ND40 does not have this option.  You will need to look at a mortise lock, L9496, or a deadbolt such as the B571.
After installing a classroom deadbolt, there is potential for the thumbturn to project the bolt only, get stuck in one position, or move both directions but not move the bolt.  These are caused fro...
The 09-611 indicator stands off the door 0.39".
The pricebook suggests (for a 1-3/4" door) using a 1-3/8" cylinder when installing with an 09-611 occupancy indicator.
Faculty Restroom Lock - With indicator cylinder. Outside knob fixed. Entrance by key only. Push-button in inside knob activates visual occupancy indicator, allowing only emergency masterkey to oper...