The Odor Guard unit from Sierra Environmental Technologies is a high-capacity, radial-flow manhole and wet well insert. It fits below the manhole lid and past steps, so it works anywhere, even in locations with water entry problems. The cylindrical media basket is held in the manhole or wet well with a tub-type holder that can be manufactured to fit any size or shape of manhole or wet well entry. The lightweight components allow the unit to be installed by one person in less than 30 minutes. It is constructed of stainless steel and other corrosion-resistant materials. 636/273-5189; www.setodorcontrol.com.