Cone Adapter With Angle Connection

Cone Adapters, Angle Connection

CNC-Ground Standard Taper Interfaces: Each adapter features precision-ground conical joints manufactured via automated grinding technology to achieve a high-vacuum matte finish, ensuring a leak-proof hermetic seal when paired with standard laboratory apparatus.

Uniform Internal Bore Geometry: Engineered with consistent wall thickness and a smooth internal radius to prevent pressure drops and minimize localized stress points during high-temperature vapor phase transitions or liquid transport.

$6.03

Quick Answer: An angled cone adapter is a glass fitting with a ground-glass cone at one end and a tube bent at an angle at the other, usually finished for rubber tubing. It plugs into a socket and leads a gas, vacuum or vent line away sideways, so the tubing does not rise straight up from the apparatus.

Why the Connection Is Bent

A straight adapter sends tubing directly out along the axis of the joint. That is awkward at the top of a reflux condenser or on a vertical flask neck, where tubing standing straight up is easily knocked, pulls on the joint and can kink. Bending the connection to the side lets the tubing run down to a bubbler, trap or gas supply along the frame, with less leverage on the ground joint.

Typical positions are the top of a reflux condenser, where the adapter leads acid fumes or displaced air to a trap; a side neck of a multi-neck flask, where it brings in nitrogen; and the end of a set-up where a vent to the fume cupboard is needed. The cone end seals like any other ground joint, with a thin band of grease or a PTFE sleeve and a joint clip.

The title does not give the angle of the bend, the joint size or the tubing connection diameter. When the line must be opened and closed at the adapter itself, the right-angle cone adapter with stopcock adds a tap. Sizes are marked on the cone and should match the socket it goes into.

Care & Handling

Support the tubing separately with a clamp or clip so its weight does not lever the adapter out of the joint.
Push tubing onto the glass end with a twisting action after wetting it; forcing it straight on can snap the tube.
Never close off a vent adapter on a heated system; there must always be an open path for expanding gas.
Remove the adapter and clean the cone after each use so grease does not harden in the joint.

Specifications

Joint end	Ground-glass cone
Other end	Tube bent at an angle, typically finished for rubber tubing
Function	Leads gas, vacuum or vent lines sideways from a socket
Seal	Light grease or PTFE sleeve, secured with a joint clip
Bend angle, joint size and tube diameter	Confirm at enquiry

Applications

Venting the top of a reflux condenser to a gas trap or bubbler
Feeding nitrogen or another inert gas into a side neck of a reaction flask
Connecting a flask to a water filter pump for gentle evacuation
Routing tubing tidily in teaching assemblies where upright lines would be knocked

Why Choose LabEquip

Research groups and college organic labs use angled cone adapters to plumb inert-gas and vent lines neatly into their ground-joint glassware. The fitting is available through LabEquip’s chemistry lab equipment catalogue; send the joint size and tubing diameter through the contact page.

Frequently Asked Questions

What is the difference between an angle and a straight cone adapter?

Both have a ground cone at one end and a tubing connection at the other. In the angle adapter the connection is bent to the side, so the tubing leaves horizontally or downwards instead of pointing straight up from the joint.

Where is an angled cone adapter used most often?

At the top of a reflux condenser and on the side necks of reaction flasks, where tubing to a gas supply, bubbler or trap needs to run away from the apparatus without pulling on the joint.

How do I attach rubber tubing to the adapter without breaking it?

Wet the end of the tubing with water or a little glycerol, hold the glass close to the end being fitted, and ease the tubing on with a gentle twisting motion. Protect your hand with a cloth in case the glass breaks.

Do I need to grease the cone?

For most work, a light smear of grease around the top of the ground zone, or a thin PTFE sleeve, gives a gas-tight seal and stops the joint seizing. Avoid heavy greasing, which can contaminate the reaction.

What joint size should I order?

Order the size that matches the socket it will fit, such as the top of your condenser. The size is usually etched or printed on the glass as two numbers or a letter-number code.

Can this adapter be used on a vacuum line?

Ground-glass cone adapters are commonly used on vacuum lines, provided the joint is clean and lightly greased or sleeved, the cone is held with a clip, and thick-walled vacuum tubing is used.

Last Updated: September 2026