Description

USA Lab Flow Control Glass Stopcock Adapters w/ 3/8 Barb

The USA Lab Flow Control Glass Stopcock Adapter with 3/8 Barb is designed to regulate the flow of gases or liquids into laboratory reaction systems. Made from 3.3 borosilicate glass, this glass stopcock adapter provides a practical flow-control connection for compatible laboratory glassware and reactor assemblies.

These Labflow, USA Lab glass stopcock adapters are designed to fit into the top of compatible reactor receiving flasks and material flasks, helping users manage the movement of gases or liquids during laboratory processing. The integrated stopcock allows controlled adjustment of flow as needed for the application.

Multiple joint sizes are available to accommodate different laboratory glassware configurations, including 24/29, 24/40, 29/32, 29/42, 34/35, and 34/45. The 3/8-inch barb provides a convenient connection point for compatible tubing and gas or liquid transfer setups.

3.3 Borosilicate Glass Flow Regulation 3/8" Barb Multiple Joint Sizes Reactor Flask Compatible

Flow Control: Integrated glass stopcock design allows users to regulate gas or liquid flow into reaction systems.

Borosilicate Construction: Made from 3.3 borosilicate glass for compatibility with laboratory glassware assemblies.

Multiple Sizes: Available in six joint-size configurations to support different reactor and flask setups.

Why buy from USA Lab

Expert Support
Engineers & technicians on staff.

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Tested and trusted products.

Fast Fulfillment
Nationwide 1-2 day shipping.

Warranty & Parts
US-based service & spares.

Why this Flow Control Glass Stopcock Adapter?

Controlled flow regulation — the integrated stopcock helps regulate gases or liquids entering a reaction system.
3.3 borosilicate glass construction — designed for use with laboratory glassware and reaction-system assemblies.
3/8-inch barb connection — provides a convenient connection point for compatible tubing.
Multiple joint sizes — available in 24/29, 24/40, 29/32, 29/42, 34/35, and 34/45 configurations.
Reactor flask integration — designed to fit the top of compatible reactor receiving flasks and material flasks.

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Technical Specifications

Specification	Details
Product	USA Lab Flow Control Glass Stopcock Adapters w/ 3/8 Barb
Product Type	Glass Stopcock Adapter
Material	3.3 Borosilicate Glass
Primary Function	Regulate Gas or Liquid Flow
Barb Size	3/8"
Joint Size	24/29, 24/40, 29/32, 29/42, 34/35, 34/45
Connection Style	Glass Joint with 3/8" Barb
Flow Control	Integrated Stopcock
Glassware Compatibility	Compatible Reactor Receiving Flasks and Material Flasks
Application	Laboratory Reaction Systems
Fluid Type	Gases and Liquids
Construction	Borosilicate Glass Stopcock Adapter
Port Configuration	3/8" Barb Connection
Size Options	Six Joint Configurations
24/29 Configuration	Available
24/40 Configuration	Available
29/32 Configuration	Available
29/42 Configuration	Available
34 Series Configurations	34/35 and 34/45 Available

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Laboratory Processing Pharmaceutical Research Chemical Sciences Academic Research

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FAQ

What is the USA Lab Flow Control Glass Stopcock Adapter w/ 3/8 Barb used for?

The USA Lab Flow Control Glass Stopcock Adapter w/ 3/8 Barb is used to regulate the flow of gases or liquids into laboratory reaction systems and compatible reactor glassware assemblies.

What material is the USA Lab Flow Control Glass Stopcock Adapter w/ 3/8 Barb made from?

The USA Lab Flow Control Glass Stopcock Adapter w/ 3/8 Barb is made from 3.3 borosilicate glass for use with compatible laboratory glassware and reaction-system configurations.

What sizes are available for the USA Lab Flow Control Glass Stopcock Adapter w/ 3/8 Barb?

The USA Lab Flow Control Glass Stopcock Adapter w/ 3/8 Barb is available in 24/29, 24/40, 29/32, 29/42, 34/35, and 34/45 joint sizes.

Where does the USA Lab Flow Control Glass Stopcock Adapter w/ 3/8 Barb fit?

The USA Lab Flow Control Glass Stopcock Adapter w/ 3/8 Barb is designed to fit into the top of compatible reactor receiving flasks and material flasks, providing a controlled flow connection for gases or liquids.

Important Shipping Notice!

DISCLAIMER:

All items are carefully packaged to ensure safe delivery. In the rare event that your item arrives damaged, please notify us within 3 days of receipt. We will promptly provide a replacement or issue a refund.

Please note that any damage occurring after delivery is not covered under warranty. We appreciate your understanding and your trust in our products.

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Specifications

Brand:	USA Lab
Material:	3.3 Borosilicate Glass
Barb Size:	3/8"

Shipping & Returns

1–3 Business Days Standard Processing

Return Policy ↗ Varies by Product Warranty Policy ↗ Varies by Product

3 Days to Claim Inspect on Arrival

Shipping

Orders ship within 1–3 business days after payment clears. We ship Monday through Friday via UPS, USPS, and freight carriers.
Freight items (crated, hazmat, dropship, or special packaging) can take 1–5 business days to ship.
Expedited shipping speeds up transit, not processing. Contact us for true rush orders.
PO Box addresses ship USPS. Alcohols, chemicals, and hazmat cannot ship to a PO Box.

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Delivery & Damage Claims

Inspect every shipment on arrival. Claims must be filed within 3 business days.
Visible damage? Refuse the delivery and have the driver document it. We will file the claim and ship a replacement.
Concealed damage: contact us within 2 days with photos of the packaging and item. Keep all packing materials.
Freight services (liftgate, residential, inside delivery) are the customer's responsibility to select for their location.

Damage & Freight Details

Returns

USA Lab branded products are returnable within 30 days of order date with prior authorization. Email us before sending anything back.
Solvents, chemicals, and consumables are not returnable once shipped. Custom and made-to-order items are final sale.
Unused items in original packaging carry a 15% restocking fee. Defective items ship back on us.
Items showing any signs of use, wear, contamination, or modification are not eligible for return.
Glassware damage must be reported within 3 business days of delivery for replacement or refund.

Full Return Policy

Custom & Made-to-Order Items

Customized and made-to-order products are final sale and not eligible for return under any circumstances.
This includes ductless fume hoods, configured tanks and reactors, and any item built to your specifications.
These products are manufactured specifically for your application. Confirm sizing, voltage, and configuration with our team before ordering.
Damage claim coverage still applies. Inspect on arrival and report issues within 3 business days.

Return Eligibility Details

Warranty

USA Lab products are covered against manufacturing defects for up to 3 years, depending on product line.
1 year: chillers, heaters, rotovaps, reactors, vacuum ovens, mixers, and most equipment. 2 years: UVP vacuum pumps. 3 years: scientific freeze dryers.
Wear items (glassware, gaskets, heating elements, sensors) and fittings/steel are not covered. Report defects within 30 days (3 days for glass).
Non–USA Lab brands are covered by their manufacturer's warranty. See the product's Warranty tab.

Full Warranty Policy

International Orders

Import duties, taxes, VAT, and brokerage fees are not collected by USA Lab and are the receiver's responsibility.
Verify your country's customs charges and import restrictions before ordering.
Refused or unclaimed international shipments are refunded minus shipping and a 15% restocking fee.
International orders are generally non-returnable. Damaged items must be reported within 3 business days.

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Summaries above are provided for convenience. The full Policies & Warranty Info pages govern all orders and may be updated at any time.

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USA Lab Flow Control Glass Stopcock Adapters w/ 3/8 Barb

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