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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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

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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

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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

Azlon™ Spare Stopcock for Narrow Neck HDPE Aspirator

For use with narrow neck HDPE aspirator

Pricing and Availability
Specifications

Type	Aspirator Stopcock
Material	HDPE

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Gosselin™ Winged Plug

Suitable for different usage of tubes and applications

Pricing and Availability

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Kartell™ Plastilab™ Straight-Bored Stopcocks

Designed for liquids and gases under low pressure or low vacuum.

Pricing and Availability
Specifications

Material	Polypropylene,HDPE

Fisherbrand™ PTFE Burette Stopckcock, Straight Through Type

Fisherbrand™ PTFE Burette Stopckcock, Straight Through Type supplied with 8mm diameter sidearm in borosilicate glass, bore is 2mm.

Pricing and Availability
Specifications

Plug Bore	2 mm
Temperature (Metric)	-200°C to +280°C
Diameter (Metric)	8 mm
Material	PTFE

Cowie Technology™ PTFE T-Type Stopcocks

Cowie Technology™ PTFE T-Type Stopcocks feature a pure PTFE body and plug and combine all the desirable properties of the Ultimate Laboratory Stopcock.

Pricing and Availability
Specifications

Includes	Borosilicate glass sidearms
Type	T-Type
Description	T-Type Stopcock
Plug Material	PTFE
Material	PTFE
No. per Pack	1 Each
Autoclavable	Autoclavable

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DWK Life Sciences Kimble™ Kontes™ FlexColumn™ Three-way Luer Stopcock

Heavy-duty nylon

Pricing and Availability

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Thermo Scientific™ Nalgene Stopcock Assembly for Acrylic Burets

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

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.