Weatherstrip.

A quick learner from 07733 says:
This slides into the bottom of the window that's prevents water from leaking inside the window. The plastic strip that slides into the window is 3/16. Thanks for any help.
Thumbnail of the uploaded file named Bubble Seal
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Lauren from SWISCO responded:

Hello, thank you for posting,

Unfortunately we do not carry an exact match for your bubble seal. The closest we can provide is the 58-135 style, but we cannot guarantee the same fit or function. Take a look at the dimensions below to see what you think! 

Profile view of 58-135
Profile view of 58-135

Identifying Replacement Weatherstripping
Identifying Replacement Weatherstripping
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