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Stopcocks

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 42 results
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

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.
4

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
5
Promotions Available

DWK Life Sciences Kimble™ Replacement Stopcock

Replacement for 17062F Series Burets

6

Synthware™ Replacement Straight Bore Stopcock
GREENER_CHOICE

Supplied with PTFE plug, one PTFE washer and one O-ring.

Includes PTFE plug, One PTFE washer, One o-ring
Type Straight Bore Stopcock
For Use With (Equipment) Straight Bore Tap
Plug Material PTFE
Material Borosilicate Glass
For Use With (Application) Organic Synthesis
7

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
9
Promotions Available

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

13

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.

14

Synthware™ Replacement T-Bore Stopcock
GREENER_CHOICE

Plug has a T-shaped bore to connect any two or all three stems.

Type T-Bore Stopcock
For Use With (Equipment) T-Bore Tap
Plug Material PTFE
Material PTFE
For Use With (Application) Organic Synthesis
15

Bel-Art™ Two-Piece Stopcocks

Two-piece design snaps together forming a tight seal, and the free-turning key needs no lubrication

Connectors Barbed
Includes Stopcock
Outlet Port Tubulated
Type 2-piece
For Use With (Equipment) Flexible plastic or rubber tubing
Plug Material HDPE
Material Polyethylene
Fits Tubing ID 12.7 mm
Pressure 7 psi