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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Thermo Scientific™ Nalgene™ Stopcocks

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

Pricing and Availability
Specifications

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

Pricing and Availability
Specifications

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

BRAND™ Straight-Bore PTFE Stopcocks

PTFE construction with polypropylene valve lever. Provides outstanding chemical resistance. Includes integrated hose nozzles.

Pricing and Availability
Specifications

Includes	Integrated hose nozzle
Plug Material	Polypropylene
Material	PTFE

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Thermo Scientific™ Nalgene™ Three-way Stopcock

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.

Pricing and Availability
Specifications

Outlet Port	Tubulated
Type	Stopcock
Plug Material	Polypropylene
Material	Polypropylene

DWK Life Sciences DURAN™ Single way Stopcock, complete with PTFE key

Shut-off with PTFE plug for grease free operation.

Pricing and Availability
Specifications

Material	Borosilicate Glass (3.3),PTFE
For Use With (Application)	Installation in glass apparatus and devices
Autoclavable	Autoclavable

Masterflex™ Stopcocks with Luer Connections

Regulate flow without any leaking using these fittings. Cole-Parmer™ Stopcocks with Luer Connections are available with either a male luer lock or a male luer slip.

Pricing and Availability
Specifications

Type	Stopcock
Plug Material	Polycarbonate and HDPE
Material	Polycarbonate,HDPE

Pyrex™ Borosilicate Glass Stopcock with Key

Manufactured from Pyrex™ borosilicate glass with PTFE key, for superior chemical resistance. Pyrex™ Borosilicate Glass Stopcock with Key are made to a taper of 1:10 giving a combination of performance and ease of operation.

Pricing and Availability
Specifications

Includes	PTFE key, Plastic screw thread retaining device
Material	Borosilicate Glass

Pyrex™ Plain Arms, Straight Bore Stopcock

Externally operated valve to regulate the flow of a liquid.

Pricing and Availability
Specifications

Type	Straight Bore Stopcock
Material	Borosilicate Glass

Masterflex™ PVDF Stopcock

Pricing and Availability

DWK Life Sciences DURAN™ Straight Valve, PRODURAN™

The perfect solution for dosing and controlling gases and liquids as a through put variant.

Pricing and Availability
Specifications

Material	Borosilicate Glass (3.3),PTFE
No. per Pack	10/Pk.
For Use With (Application)	Ideal for dosing and controlling gases and liquids; High vacuum suitability due to the thick-walled attachments; Suitable for installation in glass apparatus for vacuum applications, e.g. for the construction of steering lines (vacuum inert gas lines, nitrogen distribution rakes)
Autoclavable	Autoclavable

Pyrex™ Straight Bore Stopcock

These stopcocks are specially designed and carefully manufactured for high vacuum applications

Pricing and Availability

Pyrex™ Borosilicate Glass Aspirator Stopcock with Ground Cone

Inserts into the ground glass side-socket of an aspirator botte. Pyrex™ Borosilicate Glass Aspirator Stopcock with Ground Cone provides a leakproof seal.