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Safe2Vent dual coalescing carbon filter with the exclusive Viz-a-Ball indicator fits any 3/4" bung fitting and is designed for use with higher production aerosol can manual puncturing units. The indicator tells you when the process is complete and it is safe to open the puncturing machine. The check ball 'closes' the drum when not processing for compliance with EPA and California regulations while allowing venting of any dangerous pressures to conform to OSHA guidelines. Both single and dual models use the same replacement filters. Designed for use with 55 gal drums. AeroVent aerosol can disposal system sold separately.