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Stopcocks

Stopcocks work as valves, serving to regulate, interrupt or completely stop the flow of a gas or liquid through piping, tubing or a faucet, with tubes attached to the stopcock’s female joint easily separated or connected by a turn of the stopcock. Stopcocks may be held in place by vacuum, rubber rings or clips. Glass stopcocks need stopcock grease for lubricating and sealing the plug and shell. Glass stopcocks with plastic plugs are sealed without grease but are less effective for high vacuum. Plastic plug glass stopcocks, however, work well for low vacuum applications.
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1 – 15 of 44 results
1

Bel-Art™ Stopcocks

With a removable, leak-proof plug made of chemical-resistant, non-stick PTFE with barbed tubulations that accept 0.25 in. 0.375 in. I.D. tubing

For Use With (Equipment) Tubing
Plug Material PTFE
For Use With (Application) Tubing
Autoclavable Autoclavable
2

Thermo Scientific™ Nalgene™ Stopcocks
GREENER_CHOICE

Develop in-house fluid transfer systems for accurate filling or dispensing. These stopcocks provide reliable, accurate liquid flow control.

Type Stopcock
For Use With (Equipment) In-House Fluid Transfer System
Plug Material Polypropylene
No. per Case 6
Material Polypropylene
No. per Pack 1
3

Thermo Scientific™ Nalgene™ Three-way Stopcock
GREENER_CHOICE

Experience in-house fluid transfer system flexibility with this three-way stopcock, arranged in a T-shape to simply any two — or all three — arms of the stopcock with ease.

Outlet Port Tubulated
Type Stopcock
Plug Material Polypropylene
Material Polypropylene
4

Corning™ PYREX™ Plain Bore Rotaflo™ Stopcock

Combined PTFE and borosilicate glass forms a leak- and freeze-resistant seal

Type High Vacuum Stopcock
Temperature (English) -4°F to 392°F
Temperature (Metric) -20°C to 200°C
No. per Case 1/Cs.
Material Glass
No. per Pack 1/Pk.
5

Bel-Art™ Replacement Stopcocks

Polypropylene body has Teflon™ PTFE plug, washer and bright red handle

6

Eisco™ Burette Stopcock Plunger (PTFE)

Replacement stopcock for Eisco part CH0233B

8

DWK Life Sciences Kimble™ 2 mm Varibor Metering Value Stopcock Plug

Allows delivery of preset volumes of gases or liquids to reactions using the needle value

10

DWK Life Sciences Kimble™ Kontes™ Straight Bore Stopcock with PTFE Plug

The more exaggerated taper of this stopcock permits easier use at higher-than-ambient temperatures.

12

Thermo Scientific™ Nalgene Stopcock Assembly for Acrylic Burets
GREENER_CHOICE

For use with 25 mL Acrylic Nalgene Break-Resistant Burets.

15

Synthware™ Straight Bore Glass Stopcock
GREENER_CHOICE

Plugs and barrels are ground to be interchangable.

Type Straight Bore Stopcock
Plug Material Glass
Material Borosilicate Glass
For Use With (Application) Organic Synthesis