Check the listing for details. Refrigerant Tank Liquid Level Sensor, 3 Pin, Float, 3/4" NPTM For 30/50 Tanks. Condition: New. Listed at 153.19 USD. Gregoriou Brothers Refrigeration Since 1979Frosty-Freeze Refrigerant Tank Liquid Level Sensor, 3 Pin, Float, 3/4" NPTM For 30/50 Tanks Part# FF4LZH4 Most refrigerant recovery tanks have a 80% "tank-full" tank float. This turns off the recovery unit when the recovery tank is 80% full. The D.O.T. requires that recoverys tanks contain no more than 80% on their capacity. So 30# tanks can contain no more than 24 lbs. and 50% tanks can contain no more than 40 lbs. This is the float that "screws-into" the top of the tank. As long as the tank has a 3/4" female pipe thread fitting on the top, this float will screw into it. The connection on the float is the 3-pin style. 90% of refrigerant recovery units that use the yellow tank full cord & float, use the 3-pin connection style. Price is for one (1). Refrigerant tank level sensor FOR THE 30# or 50# tanks. Precise set point for 80% shutoff 3/4" Male Pipe Thread NPT3 Pin ConnectorCompatible with most manufactures recovery equipmentBrass ConstructionStainless Steel Float for long lifeFits 30 and 50 Pound Cylinders with 3/4" NPT PortAllows for automatic shut-off of when the refrigerant cylinder is 80% full Part# FF4LZH4 Most refrigerant recovery tanks have a 80% "tank-full" tank float. This turns off the recovery unit when the recovery tank is 80% full. The D.O.T. requires that recoverys tanks contain no more than 80% on their capacity. So 30# tanks can contain no more than 24 lbs. and 50% tanks can contain no more than 40 lbs. This is the float that "screws-into" the top of the tank. As long as the tank has a 3/4" female pipe thread fitting on the top, this float will screw into it. The connection on the float is the 3-pin style. 90% of refrigerant recovery units that use the yellow tank full cord & float, use the 3-pin connection style. Price is for one (1). Refrigerant tank level sensor FOR THE 30# or 50# tanks. Precise set point for 80% shutoff 3/4" Male Pipe Thread NPT3 Pin ConnectorCompatible with most manufactures recovery equipmentBrass ConstructionStainless Steel Float for long lifeFits 30 and 50 Pound Cylinders with 3/4" NPT PortAllows for automatic shut-off of when the refrigerant cylinder is 80% full