Bottle Top Dispenser, Premium Model

Advanced Material Integration: Features a recirculating valve and fluid path constructed from Borosilicate glass, PFA, and PTFE to ensure maximum chemical resistance against acids, bases, and organic solvents.

Precision Volume Alignment: Utilizing a smooth-turn adjustment knob and a 360° rotating discharge tube, this unit achieves 0.1% repeatability and ±0.5% accuracy across its entire specified dispensing range.

₹290.00

Quick Answer: The Bottle Top Dispenser, Premium Model is a piston-and-cylinder bottle top dispenser that screws onto the neck of a reagent bottle and delivers a preset volume of liquid each time the piston is raised and pressed down, for repeated additions of the same reagent.

Repeat Dispensing Straight From the Bottle

The dispenser mounts directly on the reagent bottle, usually through a threaded collar with adaptors for different neck sizes. Raising the piston draws liquid up the intake tube through a valve into the cylinder; pressing it down sends that volume out through the discharge tube into the receiving vessel. The volume is set on a scale or stop and stays the same stroke after stroke.

This saves time and handling in tasks that add the same volume again and again: dispensing acid for a series of digestions, measuring buffer into a set of tubes, or adding a fixed volume of reagent in routine water and soil tests. The liquid stays in a closed system, which reduces spills and the fumes released when pouring from an open bottle.

The listing calls this the Premium Model but gives no volume range, accuracy figure or wetted materials. Those details matter: dispensers are made in several volume ranges, and the valve and piston materials decide which reagents can be handled. Hydrofluoric acid, strong oxidisers and some organic solvents are excluded by many designs, so check each reagent against the dispenser’s compatibility list before use.

Specifications

Type	Piston bottle top dispenser
Mounting	Screws onto a threaded bottle neck; adaptors in typical designs
Operation	Lift the piston to fill, press down to dispense a preset volume
Volume setting	Adjustable on the dispenser
Volume range and wetted materials	Confirm at enquiry

Care & Handling

Prime the dispenser after mounting by discharging a few strokes back into the bottle or into waste, until no air bubbles remain in the cylinder.
Flush with distilled water after using reagents that crystallise, such as concentrated salt solutions, so the piston does not seize.
Press the piston slowly and steadily; a fast stroke can splash corrosive liquid from the discharge tip.
Keep the discharge tube capped between uses and stand the bottle on a level surface.
Check the delivered volume from time to time by weighing dispensed water on a balance.

Where Repeat Dispensing Helps

Dispensing concentrated acids for Kjeldahl or wet-digestion work in food and soil labs.
Adding fixed volumes of buffer or reagent in routine water-quality testing.
Filling a row of tubes with the same volume of medium or diluent.
Serving a shared reagent in teaching labs, so students do not pour from the stock bottle.

Why Choose LabEquip

Food, water and soil-testing labs, pharmacy colleges and university teaching labs that repeat the same additions every day are the usual buyers of this dispenser. It needs a threaded bottle such as the laboratory storage bottle with screw cap, provided the neck matches the collar or an adaptor. LabEquip lists it in General Lab Products, and volume range and reagent compatibility can be discussed through the contact page.

Frequently Asked Questions

How does a bottle top dispenser work?

It is a small piston pump. Lifting the piston draws liquid from the bottle through an intake tube and valve into a cylinder, and pressing it down pushes that volume out through a discharge tube, with valves stopping the liquid from flowing back.

Which bottles will it fit?

It fits bottles with a threaded neck that matches the dispenser collar or one of its adaptors. Plain stoppered bottles cannot take it, so look at the neck thread of the bottles you use before ordering.

Can it dispense concentrated acids?

Many bottle top dispensers are used for acids, but compatibility depends on the materials of the cylinder, piston and valves. Look up each reagent in the dispenser’s compatibility information; hydrofluoric acid in particular attacks glass and is excluded from glass-cylinder designs.

How accurate is the dispensed volume?

Accuracy depends on the model and the volume setting, and the listing gives no figure. You can test it yourself by dispensing distilled water into a beaker on an analytical balance and comparing the mass with the set volume.

Why are there air bubbles in the cylinder, and do they matter?

Bubbles usually appear when the dispenser is first mounted or when a valve is not seating properly. They do matter, because trapped air makes each delivered volume smaller. Prime the dispenser with several full strokes until the bubbles are gone.

How should the dispenser be cleaned?

Pass several full strokes of distilled water through it after use, especially after salt solutions or reagents that crystallise. For a thorough clean, remove it from the bottle and follow the maker’s instructions for dismantling the valves.

Last Updated: September 2026