The Wager 1800 control valve connects inverted to a candy cane-style pipe and is designed to allow for ventilation in the open position. The interior of the valve contains a canister with 12 lb of odor-scrubbing media. The media chemically changes the exiting H2S gas into a non-toxic, landfill-disposable compound. Sizes are 4 in. and 6 in. A vertical mount with a rain shield also is available.