Is this a weatherstrip?

A home owner from Fredericksburg, VA says:
May 30, 2019
It snaps into the window sash and it's starting to get very brittle. Is this replaceable? Thanks!
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Tom from SWISCO responded:
June 4, 2019

This looks like snap in glazing, which is used to hold the glass in the sash. Does that sound about right?

We don't have this exact glazing. However, it's similar in design to our 55-158-6. Look this over and let me know if you agree.
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