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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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™ 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™ 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™ Straight Bore Stopcock

Straight Bore Stopcock with a threaded pressure nut. Stopcock barrels are polished to prevent leakage due to uneven surfaces.

Pricing & Availability
Specifications

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

Synthware™ Offset High Vacuum Hollow Plug Stopcock

Stem OD: 8, 10 or 12 mm available, with hollow glass plug, Precision ground with corresponding numbers on the barrel and the plug.

Pricing & Availability
Specifications

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

Synthware™ T-Bore Stopcock, Glass

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

Pricing & Availability
Specifications

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

Synthware™ Replacement for T-Bore Glass Stopcock, Plug ONLY

Glass plug ONLY.

Pricing & Availability
Specifications

Plug Material	Glass
Material	Borosilicate Glass
For Use With (Application)	Organic Synthesis

Synthware™ T-Type High Vacuum Hollow Plug Stopcock

Precision ground with corresponding numbers on the barrel and plug.

Pricing & Availability
Specifications

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

Synthware™ Replacement Straight Bore Stopcock

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

Pricing & Availability
Specifications

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

Synthware™ Oblique Bore Hollow Plug High Vacuum Stopcock

Stem OD: 10 or 16 mm, with hollow plug, Precision ground with corresponding numbers on the barrel and the plug.

Pricing & Availability
Specifications

Type	Oblique, Hollow, High Vacuum
Plug Material	Glass
Material	Borosilicate Glass
For Use With (Application)	Organic Synthesis

Troemner™ Regular Hosecock, Stainless Steel

Deliver accurate regulation or interruption of fluid flow

Pricing & Availability

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

Promega One-Way Luer Lok™ Stopcocks

Use with the Vac-Man Laboratory Vacuum Manifold to control each port individually.

Pricing & Availability

Eisco™ Rotaflow Stopcock Adapter

Made of Borosilicate 3.3 glass with a cone size of 14/23, this adapter has a low temperature gradient to withstand high temperatures and thermal shocks.

Pricing & Availability

Stopcocks

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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™ 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™ 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™ Straight 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™ Offset 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™ T-Bore Stopcock, Glass 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 for T-Bore Glass Stopcock, Plug ONLY 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-Type 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™ Replacement Straight 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™ Oblique Bore Hollow Plug High Vacuum 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

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.

Eisco™ Rotaflow Stopcock Adapter Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More Science EducationA science education product.