Window sash vent stop replacement

Question

Not sure what this part is called.  It's inserted into a slot in the sash of a double hung window.  It's used to keep the window from opening fully.  The slot it goes into is 1.8125" x 0.25".

Tom · Accepted Answer

This part is commonly called a vent latch, though it's also called a vent stop, night latch, night lock, and many other names depending on who you talk to.

Either way, we don't have an exact match for yours. Your style is somewhat unique. The closest we appear to have in our inventory is the 26-122. This could be a good replacement option for you but the cutout it's meant to install in is 1-29/32" tall and 5/16" wide. Could you still use it?

Diagram of 26-122