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Morrison Bros 922 Combination Vent Overfill Alarm


The audible alarm whistles when the liquid level in the aboveground storage tank reaches the preset level. The pressure vacuum vent allows the tank to breathe during filling and dispensing operations

Standard Features
  •  Functions as both a pressure vacuum vent and audible alarm while utilizing a single 2″ or 3″ tank opening. Installs on the top of the vent pipe, generally 12 feet above grade
  •  105 to 120 decibel whistle alarm (measured at a distance of 1 foot with a fill rate of 90 GPM)
  •  Fully mechanical alarm does not require electricity or batteries
  •  The alarm level can be set to activate at any liquid level by adjusting the cable length to the float device
  •  Minimum fill rate of 20 GPM required for alarm to operate
Construction Details
  • Body: Anodized aluminum
  • Screens: Stainless steel
  • Rainguard: Aluminum
  • Seals: FKM
  • Ball: PTFE
  • Float: Stainless steel
Certifications & Listings Florida DEP EQ 227
Weight 7.5 lbs
Dimensions 7 × 7 × 9 in

2", 3"

Pressure Setting

6 oz, 8 oz



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