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This kit makes any plastic or glass 25- or 50-mL buret self-zeroing economically and easily. Saves you money over costly glass self-zeroing burets. No more funneling; hazardous wasteful spills are eliminated. Can be used with almost all aqueous titrants. Set adjustable fill-tube to zero mark on buret. Squeeze bottle to fill buret (not included) just above zero mark. Release and excess liquid returns to bottle and titrant falls to the zero mark. To switch to a different size buret simply reverse the adapter. Extra closure without tubing hole is included for storing titrants or carrying to the field. Material: LDPE bottle 4-feet of PVC tubing and polypropylene filling tube and adapter. Capacity: 1000mL. Nalgene #: 3645-2550.