Reddit reviews Wheaton 239259 Black Phenolic Screw Cap with PE Poly-Seal Liner, 28-400 Size (Pack of 144)
We found 1 Reddit comments about Wheaton 239259 Black Phenolic Screw Cap with PE Poly-Seal Liner, 28-400 Size (Pack of 144). Here are the top ones, ranked by their Reddit score.
Black phenolic screw capPoly-Seal liner is manufactured from low density polyethyleneUnique cone liner design offers superior torque retention and excellent sealing characteristicsIt is recommended that liner be tested prior to use for leak resistant applications
Those bottles are called a Boston Round. Not sure if there's a better source for the caps, but Amazon has them for $0.39/each (if you buy 12 dozen of them.)
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https://www.amazon.com/Wheaton-239259-Phenolic-Poly-Seal-28-400/dp/B003FSU30Q/ref=sr_1_10?ie=UTF8&qid=1541540394&sr=8-10&keywords=boston+round+caps