These polypropylene and fluoropolymer (ETFE and PTFE) adapters are for use with BRAND® bottletop dispensers and burettes.

• Most common 4 L / 1 gal. bottles have 38 mm threads
• Most common 1 L / 1 qt. bottles have 33 mm threads
• Special 35 mm thread is only for use with irrigation saline used in microbiology analyzers

Outer thread refers to the outside of the adapter

Note: Many bottles come with a "neck finish" specification; a three digit number that specifies how the thread terminates on the bottle. For most laboratory bottles this is irrelevant when selecting a thread adapter. For example, for a 33-430 neck bottle, select an adapter to fit a 33mm thread.

Choose 45 mm for adapters that thread directly to current model BRAND® liquid handling instruments. The 33 mm outer thread nests inside a 45/33 mm adapter to fit smaller bottles.