MainGuard #78

  • Below-grade blow-off for dead end water mains
  • Installs below ground inside a standard meter box
  • Unique two-pipe design allows for easy passage of debris
  • Self-draining, non-freezing, and fully serviceable from above ground

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The MainGuard #78 Blow-Off installs underground in a standard meter box. Designed and engineered specifically for flushing, the #78 provides excellent flow rates for improving chlorine residual levels and flushing disinfection byproducts (DBPs) to keep water safe for consumers. Its unique valve design allows for a full clear-channel flow that is superior to other blow-offs for moving water and passing debris easily. The #78 is also designed to allow for throttling the flow of water while at the same time covering the drain hole to avoid unnecessary erosion. The MainGuard #78 comes standard with all brass principle working parts, a 2" FIP vertical inlet, a 2 ½” NST outlet, and locking security cover. The #78 is self draining and non-freezing, and is fully serviceable from above ground. Certified to NSF/ANSI 372.
• Depths of bury over 3', per 6"
• 90° horizontal (side) inlet
• 2" MJ inlet iron w/ epoxy coat
• 2" MJ inlet all brass adapter