These Inserts are specially designed Manhole Insert, with the addition of a canister containing 20 lbs. of activated carbon, which traps and stores unpleasant hydrogen sulfide and methyl mercaptan odors. Purified air is then allowed to ventilate into the atmosphere through the canister lid. A one-way valve (to right of canister) allows water to drain, but no air to pass through it.
Advantages: Compact and corrosion resistant. Does not require routine maintenance and carbon can be replaced without removing the entire unit from the manhole. Will not interfere with installation or removal of the manhole cover. Unit (excluding carbon) is guaranteed for one year against manufacturing defects. Twenty-pound bags of replacement carbon are available.
Performance: Due to varying levels of H2S concentration, the expected life span of the Activated Carbon