Culligan RV-EZ-4 EZ-Change Level 4 RV Drinking Water Filtration System Reduces bad taste and odor, Chlorine taste and odor, sediment, lead, and cysts. as Cryptosporidium and Giardia, Mercury, Turbidity, Particulate Class I, VOC's. MTBE and chloramines RVEZ-BYP winterization kit included Quick-connect fittings with double water shut off 500 gallon capacity or 6 months NSF Certified