Unique vent system keeps hazardous volatile liquids in the wash bottles and off the lab bench. A strong, steady stream of liquid is dispensed when the wash bottle is squeezed. Choose from 6 different chemicals: acetone, methanol, isopropanol, ethyl alcohol, sodium hypochlorite (bleach) and distilled water. White closure for sodium hypochlorite (bleach) is HDPE.Unitary bottle design prevents contamination when filling the bottle; no draw tube assembly to pick-up contamination off the lab bench. To prevent cross-contamination, each bottle has a color bar, below the chemical name, which corresponds to the colored closure. Bottles come with vented 38mm closure.