Vent Stop

Hello - I recently had two of these auto resetting vent stoppers break on my single hung United Windows (I don't know the series since my builder never provided that to me), but I'm unable to find replacements anywhere. I called United and they said they don't directly sell parts and that I should visit one of their distributors like Lowe's. I went to Lowe's and they have no idea what the part number is and they can't find anything like it in their system. I've found something very similar online, but it has the orange dot on the stopper and the mechanism is much smaller than my opening.

Any assistance would be much appreciated!

Hi Lauren - unfortunately that is too small to fit in my opening. It needs to be longer and an autoreset.

Thank you