3/4" Ports: Featuring 3/4" stainless steel inlets that lasts longer than plastic inlets. Additional fitting adapters may be required depending on the sizes of plumbing pipes. Filter Included: Used with the cartridge to reduce particles like sediment, sand, soil, silt, and rust to improve overall water quality. Replacement filter included (Model WHKF-GD05). For cold water use only. Built-in Shut-off Valve: Featuring a filter-bypass switch control with pressure release button, this housing system provides an easy solution for filter replacement and also replaces WHCF-DWHV. NSF Tested and Certified: A water filtration system you can trust – certified by the National Sanitation Foundation International against NSF/ANSI Standard 42 for reduction of Particulate Class V. Optimal Maintenance: For best filtration results, it is recommended to use Whirlpool genuine replacement filters WHKF-GD05/WHPL/WHSW/WHWC. Whirlpool Premium Household Filtration System provides clean filtered water throughout your entire home – reducing wear on seals, protecting laundry appliances and keeping clothing looking new. Whirlpool whole home filtration systems reduce the dirt and rust present in municipal water supplies to improve water quality for bathing, cooking, cleaning and skincare. The included WHKF-GD05 filter also reduces the sediment from well systems that can get into home plumbing, adversely affecting water pressure and damaging major appliances. Ideal for households of 1-4 persons. This premium filtration system is strong enough for the whole family! For best filtration results, it is recommend to use Whirlpool genuine replacement filters WHKF-GD05/WHSW/WHWC. Try Whirlpool's full line of filtration system products including whole home filters, under sink filters, ice filters, replacement filters, and more.