Irritrol 100P1-S 1" Century Plus Scrubber Valve Constructed of heavy-duty, glass-reinforced nylon, the Irritrol 100 Series scrubber valves resist clogging and feature a patented continuous scrubbing mechanism to actively fight dirt, algae and other particles from disrupting the functionality of the valve. The 100 Series scrubber valves are true dirty water irrigation valves able to handle the harsh chemicals found in dirty water systems, such as chlorines, chloramines and water treated with ozones.