Open quickly when the solenoid valve is activated. Manual override to open the valve regardless of solenoid valve position. Visual indicator for indication of valve position. Large supply drain port to drain inlet side piping. Pilot operated main valve. No adjustment necessary. UL listed for deluge service in sizes 3 - 10 inches. ANSI flanged Class 150 or 300. Body bonnet is made of ductile iron per ASTM A536, Grade 65-45-12 materials. All internal ferrous surface coated with 4 mils of epoxy.