Reddit reviews Abrasion-Resistant Gum Rubber Tubing, Rated for Vacuum, Very Flexible, Red, Opaque, 45A Durometer, 1/4" ID, 1/2" OD, 1/8" Wall, 5' Length
We found 1 Reddit comments about Abrasion-Resistant Gum Rubber Tubing, Rated for Vacuum, Very Flexible, Red, Opaque, 45A Durometer, 1/4" ID, 1/2" OD, 1/8" Wall, 5' Length. Here are the top ones, ranked by their Reddit score.
Very flexibleVery soft (Shore A45)Temperature Range: -70 to 180 degree FUse with barbed fittingsFor use with water, air, ethylene glycol
Here's tubing on Amazon UK.
Stoppers. No holes, but you can buy a hole-cutter for stoppers (or make a jig to hold it and just drill a hole). You might be able to find some with holes if you look around some more.
Pyrex/borosilicate tube should be pretty easy to find as well. Usually you buy long pieces and cut and bend as needed.
Just in case there are US readers, I got these for this kind of old-school stuff:
I bought stoppers with holes and glass tube, and gum rubber tubing with no problem. That's thick-wall tube for use with vacuum, see the related products for cheaper thin-wall tubing.