[indacup]

Actually, the whole purpose of weather stripping is to act as a barrier to prevent the elements from transferring thru.

I've seen too many come back rusted... as long as the set up is done in a manner not to pinch the straw and prohibit air transfer, then you'll be fine...and assuming you position it correctly within the shaft...but why go thru all the hassle when when the Prosoft inserts can be had for pennies?