PRO VENT ABS
AUTOMATIC VENT PLUMBING AIR ADMITTANCE Replaces any secondary plumbing vent
protecting the traps of kitchen sinks, bathrooms, basins, tubs, showers,
washing machines, etc. Breaks siphoning action caused by draining water. The
differential created by draining water automatically opens sealing disc and as
drain flow stops, spring mechanism automatically closes sealing disc to keep
water seal in trap constant and prevent sewer gas from escaping drain. MUST be
located at least 6" above trap arm top.