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™ 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

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

Azlon™ Spare Stopcock for Narrow Neck HDPE Aspirator

For use with narrow neck HDPE aspirator

Pricing and Availability
Specifications

Type	Aspirator Stopcock
Material	HDPE

Gosselin™ Gosselin™ Winged Plug

Suitable for different usage of tubes and applications

Pricing and Availability

Masterflex™ 4-way Stopcock

Use these stopcocks for a variety of applications. Cole-Parmer™ 4-way Stopcocks feature a PC body and an HDPE stem.

Pricing and Availability
Specifications

Outlet Port	Male Luer Lock or A Male Luer Slip
Type	Stopcock
Plug Material	Polycarbonate and HDPE
Material	Polycarbonate,HDPE

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.

Promotions are available

Pricing and Availability
Specifications

Type	Stopcock
Plug Material	Polycarbonate and HDPE
Material	Polycarbonate,HDPE

BRAND™ Needle-Valve Stopcock and Spare Spindle

Needle-Valve Stopcock and Spare Spindle constructed of PTFE with retention device.

Promotions are available

Pricing and Availability

Rotaflo™ Borosilicate Glass Stopcocks for Aspirator

Stopcock for use with aspirator bottles 1565: series with Rotaflo™ PTFE key

Pricing and Availability

Kartell™ Plastilab™ Straight-Bored Stopcocks

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

Pricing and Availability
Specifications

Material	Polypropylene,HDPE

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

Heavy-duty nylon

Pricing and Availability

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

Thermo Scientific™ Nalgene Stopcock Assembly for Acrylic Burets

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

Promotions are available

Pricing and Availability

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.