Odor Eater Kit – Waste Tank Vent Filter – Base KitFeatures:Advanced quick disconnects make replacement “a snap”Advanced check valve eliminates odors from the tank when changing the filterHigh-capacity media design stops odor fastCompatible with all waste systems or holding tank installationsEasy retrofit – compatible with older vesselsFor vent hose size: 5/8” or 3/4″This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.