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3/4 in. Closed Cell Backer Rod
DescriptionSika Backer Rod is used to partially fill deep expansion joints and cracks before application of your sealant. It helps prevent 3-sided adhesion while allowing you to control the depth of the sealant. Available in 3/4 in., 20 ft. length.
Easy to apply
Highly flexible and compressible
Will not absorb water
Good temperature resistance
Partially fills deep cracks before sealant application
Safe for the environment
Comments from reddit and forums
Discussed in turn off passenger side fan? in the Tesla Motors Club community
First, I'll note that I discovered in another thread that you can purchase the 3D-printed vent cover for $20 + $5.80 shipping here: Vent Cover for Tesla Model 3 by Ludicrous Tesla ... ... more
Much easier/simpler/cheaper than 3D-printing a custom cover: Just buy some 3/4" foam backer rod*, cut an appropriate length piece, and shove it in the vent opening. Voila. My brother ... ... more