Culligan RV-EZ-3 EZ-Change RV Drinking Water Filtration System, Level 3-Advanced Filtration Reduces: bad taste and odor, atrazine, chlorine, cysts, lead, lindane, sediment, turbidity and nominal particulate class I Features twist-on and twist-off mechanism, quick-connect fittings double water shut-off NSF certified 6-Month 500-Gallon capacity Includes a winterization kit with a RVEZ-BYP bypass for winterization