This hazardous and corrosive chemical pourer is manufactured fully from PTFE and has totally inert pouring surfaces; even the neck-sealing ring is encapsulated in PTFE. The unique design allows direct and controlled pouring due to the incorporated breather vent. The pourer comes in four sizes to fit standard reagent bottles with neck sizes of GL45, 38, 32 and 30. A captured PTFE closure ensures contaminant free contents when not in use. (Bottle not included).