Product details:

DuPont Universal Valve-In-Head Whole House Filtration System PF38001C Series that filters up to 15,000 gallons for home or office. Filter includes Universal 800 Series Carbon Wrap 2-Phase Cartridge. Its Easy-Glide by-pass valve lets you replace cartridges without shutting off water. The Clear casing makes it easier to monitor life of whole-house water filter.