Aqua Fresh™ GAC Sediment Pre-Filter Cartridge (A01-1137) by Valterra®. 2 Pieces. This product is meant to ensure the water in your RV is filtered to high standards and is free of contaminants and impurities. It’ll help you stay assured that you always have clean and good-tasting water to drink while RVing. The product is made to stringent quality requirements using top-grade materials. Don’t save when it comes to your health. Invest in reliable water filtration products.