Durable, noncorrosive plastic construction. Prevents contaminates from entering household water supply. Adjustable flow control stem. Unique balanced diaphragm design. Safe, low voltage solenoid. Internal bleed for manual operation. Sealed solenoid with low power consumption. Body and lid are molded with heavy-duty (pipe fitting grade) ultra violet-protected PVC (polyvinyl chloride) that meets NSF 14 standards. Molded thermoplastic elastomer diaphragm (NSF) 61 listed. For outdoor use with cold water only.