Dometic DVF Vent Filter for Holding TanksDometic goes that extra mile so that you don't have to and reducing use of chemicals is always our aim, especially in a marine environment.  The Dometic DVF vent filter ensures just that and is designed to absorb odors from a holding tank vent and keep the surrounding air clean and pleasant.  The vent filter eliminates the need for any holding tank chemicals since it is manufactured with a superbly effective odor-absorbing filter material. Adapters for different vent hose sizes are included in the kit.Features:No chemicals neededAbsorbs odorsEnvironmental awarenessLegacy P/N 309311004 and 309311001 *Sold as an Individual WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.