SeaLand/Dometic SaniGuard Vent Filter with Bracket for 1 1/2" hose. Part # 309310003

Prevents holding tank odors from escaping through the vent.  Works 2.4 times better than other brands.  

Do not over fill the tank to prevent damage to the filter.

Replace the SeaLand / Dometic Vent Filter every year for best results.