Andersen / Emco Replacement Mortise lock used with 4000 Series Full view Quick Change Glass and screen inserts.
The 4000 series storm door has a button above the handle. To replace glass the button is pushed up and the lever is lifted to a vertical position. Remove Glass or Screen panel to change

Lock Application: 4000 Series Quick Change System, Full View Storm Door
Handed: Yes 
Markings on Lock case: Black nylon guide below latch, L or R on metal
Cylinder Type: Euro Profile 
Cylinder to Handle PZ: 2-1/2 inches (63mm)
Contents: Lock Case and Screws, No Faceplate 

NOTE: Handing determined from Outside, by location of handle set: handle set on the right is Right Hand - handle set on the left is Left Hand 

Related Andersen Storm Door Parts
306026 - Compatible with the 3000 Series 45 min Easy Install, Left Hand
306027 - Compatible with the 3000 Series 45 min Easy Install, Right Hand
306029 - Compatible with the 4000 Series 45 min Easy Install, Left Hand