The Pre-trimmed Model F-2 Groove/Groove Dry Valve package is completely pre-assembled with galvanized nipples and fittings, and includes the water supply control valve, air supervisory switch, and alarm pressure switch. Available accessory items include (at additional cost) Model D-2 and Model E-1 Accelerators/Trim Kits to speed valve operation on large capacity systems, and anti-columning and anti-flood devices.