Convenient and easy to use, these filters are disposable exterior pre-tank filters for drinking and cooking water. It also filters dirt and sediment to keep the storage tank clean and clear. For use with 3/4S flexible hose couplings in RV or marine applications. Reduces bad taste &odors, chlorine taste odor and sediment. Fits standard hose fittings. Cartridge life: 2,000 gallons or one RV season. NSF certified.