The MainGuard 77 blowoff provides the best in performance and value! Engineered specifically for flushing, the #77 provides excellent flow rates for improving chlorine residual levels and flushing by-products to keep water "fresh". Its unique valve design allows for a full "clear-channel" flow that is superior to other blowoffs for moving water and passing debris easily.
The #77's plunger is designed to allow for throttling water flow while at the same time covering the drain hole to avoid unnecessary erosion. the MainGuard 77 comes standard with all brass and aluminum working parts, nozzle sizes 2-1/2" NST or smaller, traffic break-away, self-draining non-freezing drain, 2" FIP vertical (straight) inlet, locking security cover. Low-lead option available. Certified to NSF/ANSI 372.
Approximate shipping weight: 60 lbs.
The MainGuard 78 Blow-Off installs underground in a standard meter box. Designed specifically for flushing, the 78 also provides excellent flow rates and full clear-channel flow. The MainGuard 78 comes standard with all brass working parts, nozzle sizes 2-1/2" NST or smaller, traffic break-away, self-draining non-freezing, 2" FIP vertical straight inlet and locking security cover. The MainGuard line is fully serviceable from above ground. Also certified to NSF/ANSI 372.