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.

31 – 45 of 442 results

Synthware™ 120° Bore Stopcock

Bored to allow connection of any two arms at once.

Pricing & Availability

Synthware™ Replacement 120° Bore Stopcock

Stopcock has bores to allow connection of any two arms at once.

Pricing & Availability

Synthware™ High Volume Double Oblique Bore Glass Stopcock with Constant Pressure Retention

Barrel and plug are precision ground, handlapped with corresponding numbers on the barrel and plug.

Pricing & Availability

Synthware™ Double Oblique Bore Glass Stopcock

Double Oblique Bore Stopcock has diagonal, parallel bores to allow connection of single stem to both stems on the opposite side. Hollow glass plug option is precision ground with corresponding numbers on the barrel and the plug

Pricing & Availability

Synthware™ 90° High Vacuum Hollow Plug Stopcock

Precision ground with corresponding numbers on the barrel and plug.

Pricing & Availability
Specifications

Type	90° Glass High Vacuum Valve
Plug Material	Glass
Material	Borosilicate Glass
For Use With (Application)	Organic Synthesis

Synthware™ Double Oblique Bore PTFE Stopcocks

Double Oblique Bore Stopcocks have diagonal, parallel bores to allow connection of single stem to both stems on the opposite side.

Pricing & Availability
Specifications

Type	Double Oblique Stopcock
Plug Material	PTFE
Material	Borosilicate Glass
For Use With (Application)	Organic Synthesis

Synthware™ Replacement Metering Stopcock

Stopcock comes with a threaded PTFE needle valve for the fine control of flow through the bore of the stopcock plug.

Pricing & Availability
Specifications

Type	Metering Stopcock
For Use With (Equipment)	Metering Valve
Plug Material	PTFE
Material	Borosilicate Glass
For Use With (Application)	Organic Synthesis

Synthware™ Replacement for Straight Bore Glass Stopcock, Plug Only

Glass plug ONLY.

Pricing & Availability
Specifications

Type	Replacement Stockcock
For Use With (Equipment)	S69 Series
Plug Material	Glass
Material	Borosilicate Glass
For Use With (Application)	Organic Synthesis
Autoclavable	Autoclavable

Synthware™ Replacement T-Bore Stopcock

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

Pricing & Availability
Specifications

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

Synthware™ Straight Bore Glass Stopcock

Plugs and barrels are ground to be interchangable.

Pricing & Availability
Specifications

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

Synthware™ T-Bore Stopcock, PTFE

T-shaped bore connects any two or all three stems.

Pricing & Availability
Specifications

Type	T-Bore Stopcock
Plug Material	PTFE
Material	Borosilicate Glass
For Use With (Application)	Organic Synthesis

United Scientific Supplies PP/PTFE Stopcocks, 6 Pk.

United Scientific PP/PTFE Stopcocks are leak-proof and available in both two and three way

Pricing & Availability
Specifications

Connectors	Serrated Ports
Includes	Stopcock
Outlet Port	Serrated
Plug Bore	6 to 10 mm
Type	Stopcock
For Use With (Equipment)	Lab Tubing
Plug Material	PTFE
Material	Polypropylene,PTFE
For Use With (Application)	Stopcock for Lab Tubing
Autoclavable	Autoclavable

Eisco™ Burette Stopcock Plunger (PTFE)

Replacement stopcock for Eisco part CH0233B

Pricing & Availability

Eisco™ Glass Stopcock with Standard Ground Joint

Glass stopcock with standard ground joint is designed for use with 1000 to 2000 mL aspirator bottles.

Pricing & Availability
Specifications

Connectors	2-way
Includes	Socket
Type	Stopcock Key
For Use With (Equipment)	Aspirator bottles
Diameter (Metric)	4 cm
Plug Material	Borosilicate Glass
Material	Borosilicate Glass (3.3)
For Use With (Application)	Dispensing liquid
Autoclavable	Autoclavable
Width (Metric)	2.54 cm

Bio Rad Laboratories 2WAY STOPCOCK PLYPRP F-M 10/PK

Two-way Stopcock, Female to male luer, Polycarbonate, Polypropylene

Pricing & Availability

Stopcocks

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Synthware™ 120° Bore Stopcock Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Synthware™ Replacement 120° Bore Stopcock Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Synthware™ Double Oblique Bore Glass Stopcock Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Synthware™ 90° High Vacuum Hollow Plug Stopcock Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Synthware™ Double Oblique Bore PTFE Stopcocks Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Synthware™ Replacement Metering Stopcock Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Synthware™ Replacement T-Bore Stopcock Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Synthware™ Straight Bore Glass Stopcock Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Synthware™ T-Bore Stopcock, PTFE Greener ChoiceOffers one or more environmental benefits itemized in the U.S. FTC “Green Guides.”Learn More Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

United Scientific Supplies PP/PTFE Stopcocks, 6 Pk. Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More Science EducationA science education product.

Eisco™ Burette Stopcock Plunger (PTFE) Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More Science EducationA science education product.

Eisco™ Glass Stopcock with Standard Ground Joint Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More Science EducationA science education product.