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The United Scientific RSTPK2 Premium Laboratory Black Rubber Stoppers are designed for versatility and durability, featuring a tapered design for easy use. Made from high-quality natural rubber, these stoppers are reusable and eco-friendly, suitable for sealing a variety of laboratory containers. With a temperature range of -25 to 70°C, they are perfect for both industrial and educational settings.
| Customer Reviews | 4.3 out of 5 stars 303 Reviews |
P**T
Good For Many Uses
They are rubber corks meant for science, but we used them for something different. In building a portable solar generator (DIY Goal Zero Yeti 400) I was trying to find a way to secure the bettery inside of the plastic ammo box used for the generator housing to attach everything to and needed a way to protect the battery from the screws protruding in from attaching things to the outside of the box. I screwed the charge controller and inverter on opposite sides of the box and used these rubber pieces to screw onto the back of the pointy end of the screw inside the box. This worked great not only to protect the battery from the screws, but they also happened to be the exact right size to where the battery slips in the box, snuggly right between the rubber bumpers with no modification using a 396wh battery. Sometimes you need to think outside the box and this worked perfectly for what I needed them for!
C**S
Excellent
Perfect for what I was using them for especially with the different sizes they had
R**S
Works great with filter flask
Works great. I used it for an object lesson experiment with a flask and filter. I gave it 4 stars only because I only needed one stopper but couldn’t find it in smaller quantities.
K**T
Description was not clear on the amount received.
This is a great product but the description says 1 pound/ 50 count bag of stoppers. It doesn’t say 1 pound OR 50 count. Received 36 stoppers.
T**J
Excellent value
I couldn't believe how many stoppers and how many different sizes that I received for such a reasonable price. They did a great job on the project which I was doing.
D**N
Item not as described. Stoppers had holes.
These seem like high-quality stoppers, and they came quickly. Unfortunately, though the packaging says they are Solid, ALL of my stoppers had a hole through the center.
D**H
A+ product
Used these to plug holes in a tank while cleaning it. Good variety of sizes, rubber flexible, excellent value
S**A
Not as advertised
Good variety of sizes, however only received 35 stoppers when the description said 50.
H**T
Excellent quality and choices
Excellent choices
B**P
Good quality products
Worked to plug a live well drain hole in boat
R**.
a lot of different sizes
Used for bat drain plugs they work
S**O
Perfect.
Exactly as advertised. High quality, good selection … wouldn’t hesitate to order again.
J**E
Un bon lot très utile
Tous les formats sont pratiques. Bon prix de lot
Trustpilot
4 days ago
3 weeks ago