Oh my goodness. Ok that would need to be a specialized tube. There are lots of build your own solar sites, have you checked them to see where they source the parts?
I have two 6' patio doors, and I want to add blackout curtains to keep the sun/cold out. What is the best way to hang them, and what can I use to push the curtains ba...
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The end of this tube is very hard. I slightly tried to punch the end of a knife into it and also tried a large paper clip but neither budged it. I was a bit timid in ...
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I am a mid to intermediate level seamstress. I've had two machines over the past 40 years, a Kenmore, followed by a White sewing machine, both very nice sewing machi...
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Google! What is your project?
I would try Amazon first.
3" by what? here is a 3x4".... https://www.webstaurantstore.com/sterno-products-85332-3-x-4-clear-glass-cylinder-globe/223019.html?utm_source=Google&utm_medium=cpc&utm_campaign=GoogleShopping&gclid=Cj0KCQjwxbzdBRCoARIsACzIK2luRf8V6vhKYMtrFOi7O9GrxSSgrArRkWOfpNVAZuvKfLxYaIOLWB0aAlqlEALw_wcB
https://www.ebay.com/bhp/glass-cylinder-lamp-shade
Acrylic tubes are cheaper.... https://www.amazon.com/Source-Deluxe-Clear-Acrylic-Inches/dp/B077DW746R/ref=asc_df_B077DW746R/?tag=hyprod-20&linkCode=df0&hvadid=241919596732&hvpos=1o5&hvnetw=g&hvrand=16539614666520315197&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9028749&hvtargid=pla-400056486861&psc=1
Here is a link from Amazon and hope this is what you are looking for.
https://www.restaurantsupply.com/hollowick-4845?keyword=&k_clickid=5d2b424a-fa9e-4c32-a425-121d0080ce68&gclid=Cj0KCQjwxbzdBRCoARIsACzIK2ktMjxzjb3b__N3oBRhTMywyzDxXD96xhwDkhwkthXOXlpKO6J3xRYaAkiAEALw_wcB