Professional grade. Anti-siphon control prevents backflow. Body construction is of durable, noncorrosive thermoplastic that prevents ultraviolet light deterioration. Has flow control and atmospheric vacuum breaker. Balanced pressure diaphragm design, easy to disassemble for cleaning and has stainless steel screws. Operates automatically or manually and has an external bleed for manual operation. 24V AC and works well with all major brands of timers. Rustproof solenoid. Meets IAPMO-UPC codes. Includes wire connectors and waterproof seals.