Dimensions: 12.4L x 8.27W x 3.94H in.. Durable plastic construction. White finish. NSF certified. Twist on/off mechanism, no tools required. The Culligan Drinking Water Filtration System Level 1 provides a convenient and easy way to improve water from your sink. This water filtration system reduces bad tastes and odors as well as sediment, and features a durable plastic construction with a double water shut off. It's also designed with a twist-on/twist-off design, so no tools are required for installation.