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How it Works


Place the RX on a properly cleaned manhole ring and the gasket on the bottom of the outer lip of the tub to create an air tight seal. This placement directs air flow upward through the vent holes and into the media.

The deflector plate distributes the air flow properly throughout the media. It also prevents a channeling of the flow straight upward from the vent holes.

A chemical action occurs while the air is in containment in the media. During this time the media coverts the H2S to iron pyrite or fool’s gold. The resulting material is non-hazardous and easily disposed of.

Make sure that the air is allowed to flow out from under the manhole cover. Do not seal. The manhole must breathe for proper removal. The pick hole plus leakage around the base of the manhole cover will normally be sufficient to allow the flow. H2S will not affect the screening material & stainless steel vessel.

OdorKnocker with Media and in a manhole in the field