Best Lab Rubber Stoppers
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Reviews
Find Best Price at Amazon"Also, I reamed until the top of the step drill leveled out with the top of the stopper, then turned the stopper over and reamed the bottom of the hole quite a bit."
"Great buy and works great."
"Delivered as expected."
"Works great for our laboratory, arrived safely."
"Fit my yeast starter beaker just fine."
"Much harder than I expected."
Convenient assortments of various sizes of rubber stoppers in 1-lb.
Reviews
Find Best Price at Amazon"These RSTPK4 Rubber Stoppers, Sizes 2 to 8 - Assortment each has 2-Holes for your tubes from United Scientific and are sized from a smallish. #2 which will fit into the hole of a wine bottle completely and won't come out easily, has a small end smaller than a dime (16 mm), #3 whose small end is larger than a penny (18mm) and is even harder to get along with around a wine bottle and a. #4's small end is about 20mm and top is 26mm, and this was the first I measured both top and bottom for slope comparisons. #6 is the sad sack of this sack of stoppers and is 26 and 31mm. These stoppers are Good quality, just not as good as Silicone stoppers, but cheaper and at a List Price: $16.20 where you pay only $11.79 ($11.79 / EACH bag) and free Shipping for Prime Members, I'd say it is well worth if for 27 stoppers."
"Sizes and quantity received; #2-4, #3-4, #4-5, #5-4, #6-5, #7-3, and #8-3."
"I use them to insert 5mm glass tubing, a nice snug fit and seal."
"Got these in and had a ball showing the kids various ways that they can be used in science apparatus set ups."
This is a drilled tapered rubber bung for a better seal and holds the airlock securely in place.
Reviews
Find Best Price at Amazon"Works perfectly for 1 gallon glass jugs."
"fit good in the gallon jug and are made well."
"Not the "fermenthaus" brand in the advertised pic."
"The stopper goes in but works it’s way out soon."
"It doesn't fit my 1 gallon glass jug."
"Perfect size for the 1 gallon jars and their airlock."
"purchased for my catalyst fermenter."
"Dont really fit into my 1 gallon growlers... keep squirting out... Not sure why."
Best Lab Corks
Teachers in pre-K, elementary, and secondary classrooms use science education kits and products alongside science, technology, engineering, and math (STEM) curriculum to demonstrate STEM concepts and real-world applications through hands-on activities. Set contains 100 corks.
Reviews
Find Best Price at Amazon"There's not much to say about them...they're corks and do what their needed for."
"Good Quality and quick shipment."
"These are great!"
"Very small."
"Nice range of sizes."
Best Lab Cap Plugs
These caps are known for providing the widest range of chemical compatibility and for being the most temperature tolerant of plastic closures. F217 and Teflon lined caps - Foam backed Teflon PTFE liners resist attack from virtually all chemicals at room temperature and provides resilience for a tight seal with a low moisture transmission rate.
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