features the easy snap safety latch to minimize spillage if accidentally tipped over and a larger diameter funnel for easy pouring. vent system helps reduce fumes and splashing. removable neck screen traps large particles, like stir bars. available in 10-in. diameter funnel with 83b closure and 5-1/2 in. funnel with 38-430 closure. nalgene containers are recommended. for solvent, chemical and biological waste. us patent 6,752,183.