" 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. "
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