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FMM-ASO Series- Overfill Warning Valve For Waste Oil Systems

PATENT 5007450 "FMM® brand" warning valve with optional alarm for use on waste oil evacuation systems, which use an air operated pump.


  1. Valve installs on a 2" bung opening at the top of the tank. Air supply is routed through the valve before going to the pump.
  2. When liquid level reaches 90% of tank capacity, the float rises and rotates the valve piston. This closes off air to the pump causing it to shut off. Air is diverted to the audible signal on Model ASO- 91S series.
  3. The valve resets itself when the liquid level in the tank goes back down below 90% full.


FMM-ASO Series- Overfill Warning Valve For Waste Oil Systems
SkuDescription1Qty
MOFMMASO91Standard Valve Without Audible Signal $257.49
MOFMMASO91SStandard Valve With Audible Signal $287.19
MOFMMASO91EXSame As MOASO91 But With Extended Body For Use On Double Wall Or Vaulted Tanks $331.82
MOFMMASO91EXSSame As MOASO91EX But With Audible Signal $366.46
MOFMMATO91High Level Turn-On Sump Applications (No Signal) $257.49