Comparison : Item # B3651-101, PurgeX Infrared Sensing Lubrication System with 1 Air-Operated PurgeX Pump, Nema 12 Enclosure, 100-240VAC 50/60Hz
Item # YB4147-101, PurgeX Infrared Sensing Lubrication System with 1 Air-Operated PurgeX Pump, Nema 12 Enclosure, 1/2 gal Polycarbonate Reservoir, 100-240VAC 50/60Hz
Item # B3651-102, PurgeX Infrared Sensing Lubrication System with 2 Air-Operated PurgeX Pumps, Nema 12 Enclosure, 100-240VAC 50/60Hz
Item # YB4147-102, PurgeX Infrared Sensing Lubrication System with 2 Air-Operated PurgeX Pumps, Nema 12 Enclosure, 1/2 gal Polycarbonate Reservoir, 100-240VAC 50/60Hz
Item # B3651-103, PurgeX Infrared Sensing Lubrication System with 3 Air-Operated PurgeX Pumps, Nema 12 Enclosure, 100-240VAC 50/60Hz