The trouble with volatile solvents is — they’re volatile. As vapour pressure builds up inside conventional washbottles, solvent is forced into, and through the spout. The result is a steady drip of flammable solvent from the tip — a chronic problem that can be a serious safety hazard. A unique, patent pending two-way valve mechanism stops the build up of solvent vapour pressure, so Azlon polyethylene venting wash bottles won’t leave pools of flammable solvents. The valve closes when solvent is dispensed in the usual way. Indelible labelling with hazard codes.