Wide mouth for easy, safe filling. Colour coded caps for easy identification. Graduated. Ingenious cap designed to avoid involuntary dripping due to pressure build up in bottle - where toxic or radioactive material is being used. Available in the colours: 00 neutral, 04 blue, 06 yellow, 10 red. For example: 1638- 10 is a red capped 500 ml wash bottle. SUITABLE FOR FOODSTUFF.