Specifications

Double-End Gas Tube · Specifications

Standard sizes are listed below. All products comply with GB/T, ASTM, and ISO standard taper systems. Full range 10/19 ~ 60/45 available. Custom joint combinations and lengths are available.

Request custom specs

1. Straight Double-End Gas Tube

GB/T	ASTM	ISO	Length (mm)	Material
Please contact us to confirm the available specifications.

2. Reducing Double-End Gas Tube

GB/T	ASTM	ISO	Length (mm)	Material
Please contact us to confirm the available specifications.

3. Double-End Gas Tube with Side Arm

GB/T	ASTM	ISO	Length (mm)	Features	Material
Please contact us to confirm the available specifications.

* Joint numbers (10#, 14#) indicate the largest diameter (mm) of the taper. All are 1:10 taper.
* GB/ASTM/ISO designations are different standard identifiers — physical dimensions are identical and fully interchangeable.
* Full range 10/19 ~ 60/45 available upon request.
* Lengths can be customized based on apparatus setup.
* Side arm versions are ideal for gas absorption experiments.
* Contact our sales team for MOQ and lead time on custom orders.

✦ Customization Services — We offer custom joint sizes, joint combinations, lengths, and optional features. Share your specific requirements and our technical team will provide a tailored solution.

Product Description

The double-end gas tube is a tubular accessory for connecting apparatus and transferring gases or liquids in standard taper glassware systems. Featuring a standard taper joint at each end, it connects directly to standard joint glassware without the need for rubber tubing transitions, reducing leak points and simplifying apparatus assembly.

The tube can serve as a reaction vessel for reactions requiring simultaneous introduction of two different materials or gas exchange. It can also be used for liquid storage and transfer, or as an intermediate connector in experimental setups.

Key Features

Borosilicate Glass 3.3: Meets ISO 3585, low thermal expansion, thermal shock resistance up to 280°C, excellent chemical durability
Multi‑Standard Compliance: Precision‑ground 1:10 taper meets GB/T, ASTM E, and ISO 3585 standard taper specifications for full interchangeability
Dual-End Connection: Standard joints at both ends allow direct connection without rubber tubing
Versatile Configurations: Straight (same joint size) and reducing (different joint sizes) options available
Optional Features: Side arm for gas introduction, stopper versions for sealed storage
High Clarity: Clear observation of reaction progress and material changes

Quality Assurance

Each double-end gas tube is inspected for taper accuracy and surface finish to ensure reliable sealing with all standard joint components. Custom bulk orders are welcome.

Tip: Ensure both joints are clean and dry before use. Insert with a gentle twisting motion. Reducing tubes are ideal for connecting apparatus of different sizes.

Applications

Typical Uses

Distillation

Connect distillation flasks and condensers

Gas Absorption

One end for gas in, other end connected to absorption media

Reaction Vessel

For reactions requiring two feed streams or gas exchange

Liquid Storage & Transfer

Store and transfer liquids between apparatus

Intermediate Connector

Connect and buffer between apparatus

Series Gas Lines

Chain multiple apparatus in gas pathways

Compatible Equipment

Standard joint flasks, reaction tubes, receiving vessels

Distillation heads, fractionating heads, condensers

Gas generators, absorption apparatus

Three-neck and four-neck flasks

Tip: Always use matching standard joint sizes for optimal sealing. Reducing tubes are ideal for connecting apparatus of different sizes.

Operation & Maintenance

User Guide

Before Use

Inspect for cracks, chips, or scratches on any joint
Clean both joints with a soft cloth to remove particulates
Confirm that both joint sizes match your apparatus

Installation

Align one joint with the first apparatus and gently twist to seat
Align the other joint with the second apparatus and gently twist to seat
Use a clamp on the tube body for support if needed
Verify all connections are secure and sealed

Side Arm Operation

Connect gas lines to the side arm using appropriate tubing
Use hose clamps to secure connections
Monitor gas flow direction for safety

Cleaning & Storage

Clean immediately after use to prevent residue buildup
Use soft brushes and appropriate detergents for the tube interior and joints
Air dry and store with protective paper between ground joints
Protect joints from impacts