Wheaton W830029 PTFE Calibrex Bottle Top Dispenser Adapter, 18.8mm Neck Size - Lab-Grade Chemical Dispensing for Solvents & Acids | Perfect for Pharmaceutical, Research & Industrial Laboratories

Calibrex 520 and 521 bottle top dispensers come standard with a 32 mm screw thread, and included with each dispenser are three polypropylene bottle neck adapters (28, 40, and 45 mm for the 520 model; and 38, 40, 45 mm for the 521 model).

Calibrex 520 and 521 bottle top dispensers

Adapter fits 19/26 standard taper jointed bottle tops

Standard with a 32 mm screw thread