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 421 results

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™ 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™ 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™ 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™ 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™ 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™ 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

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-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

Troemner™ Regular Hosecock, Stainless Steel

Deliver accurate regulation or interruption of fluid flow

Pricing & Availability

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

World Precision Instrument 1-Way Stopcock - Luer Lock, Polycarbonate & Polyethylene

1-Way Stopcock,
Female Luer lock/Male Luer Slip
Polycarbonate & Polyethylene
Package of 10

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

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 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™ 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™ 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™ 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™ 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™ 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

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-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

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.

World Precision Instrument 1-Way Stopcock - Luer Lock, Polycarbonate & Polyethylene 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.