Multipurpose Rubber Bulb

Quick Answer: The Multipurpose Rubber Bulb is a hand-squeezed rubber bulb with a neck that can be used either to draw liquid up or to push a puff of air out. A multipurpose rubber bulb covers small suction and air-blowing jobs that do not need a dedicated filler.

One Bulb, Two Directions

Squeezed before it is attached, the bulb supplies suction on release; squeezed after it is attached, it pushes air forward. That symmetry is why a single bulb turns up in so many small tasks: lifting liquid into a pipette or glass tube, blowing the last drop from a jet, clearing water from a narrow tube, or puffing dust off a slide or lens without touching the surface.

It differs from a pipette bulb mainly in intention. A pipette bulb is shaped to seal on a pipette top, whereas a general bulb is chosen for a comfortable squeeze and a neck that can take a short length of tubing or a glass nozzle. The 3 way pipette filler remains the right tool when a measured volume is needed.

The exact shape of the bulb, its neck size and whether it carries a nozzle or valve should be matched before ordering to the tubes or pipettes you plan to use.

Everyday Uses

• Drawing liquid into glass tubes, droppers or larger pipettes for rough transfers
• Blowing a jet of air to dry the inside of a narrow tube or a burette tip
• Puffing dust from microscope slides, lenses and small components
• Starting a siphon or pushing liquid along a length of tubing

Specifications

Care & Handling

• Squeeze the body of the bulb, not the neck, to avoid splitting the joint between them.
• Keep liquid out of the bulb when it is used for suction.
• Keep a separate bulb for blowing air onto optics so it never carries liquid residues.
• Wash in warm soapy water, squeeze dry and store out of sunlight.

Why Choose LabEquip

General bulbs are bought for prep rooms, electronics and optics benches, and as spares in practical kits. LabEquip lists them under General Lab Products; describe the job the bulb will do on the contact page so the right shape can be matched.

Frequently Asked Questions

Can this bulb replace a pipette filler?

For rough transfers, yes. For measured volumes it is less convenient, because the level must be set by removing the bulb and using a fingertip, whereas a filler’s valves hold the liquid while you adjust it.

Is it safe to blow dust off lenses with it?

Yes, provided the bulb is clean and dry inside. A puff of air removes loose dust without touching the coating; use lens tissue afterwards only if marks remain.

How do I start a siphon with a rubber bulb?

Squeeze the bulb, fit it to the outlet end of the tubing, and release it so liquid is drawn over the highest point. Remove the bulb with the outlet held lower than the surface of the source liquid, and the flow continues.

Can the bulb be used with solvents?

Rubber swells and weakens in organic solvents, and vapour drawn into the bulb lingers there. Use it with water and dilute aqueous solutions, and choose glass or plastic tools for solvents.

Why does the bulb stay flat after squeezing?

The rubber has aged and lost its springiness, or the neck is blocked by dried residue. Clear the neck with warm water; if it still recovers slowly, replace the bulb.

How is it different from a mucus sucker or ear syringe bulb?

Those are made for personal care and have a fixed nozzle. A multipurpose bulb is intended for bench tasks and is fitted to glassware or tubing as the job requires.

Last Updated: September 2026