reliable installation in the field

this specific part is designed for steam pressure systems

High-Speed Contact Separation: Snap-action bimetal element ensures rapid switching to prevent arcing and extend the life of the internal SPST contacts

For field technicians and contractors managing refrigerant circuit integrity

While the standard RV48 features a vent hole

Johnson Controls A-4000-121 Oil Indicator Els PW 17895 reliable installation in the fieldThe Johnson Controls A 4000 121 is a critical pneumatic oil indicator replacement cartridge designed for high performance compressed air treatment in pneumatic control systems. As a veteran technician knows, maintaining oil free air is non negotiable for protecting sensitive downstream components like pressure reducing valves and actuators from fouling. This replacement cartridge is specifically engineered for use with the A 4000 120 oil indicator and