The Q-Series is the ultimate "user friendly" inline filter on the market. Replacement is as easy as unscrewing the filter body from the permanent head and screwing in the replacement. The Q-Series is also available with the optional Twist Tap in-head valve system, which automatically turns the supply water off when the body is disconnected from the head. No tools. No drips. No hassles. The Q-Series is available in 2.5" diameter, and in lengths of 6", 8", 10", 12" and 14".