Johnson Controls T-4000-3139 Plastic Cover these are specifically sized for

these are specifically sized for the lower pressure and higher flow requirements of natural gas heating systems

Key Benefits for Technicians: Universal Compatibility: Serves as a direct 120V replacement for Norton 41-405

Contractors trust this part for its consistent switching capabilities and compatibility with various industrial motor control systems

the 3A @ 277V rating confirms that it can safely handle the 208/240V typically found in Bard HVAC units

Johnson Controls T-4000-3139 Plastic Cover these are specifically sized forThe Johnson Controls T 4000 3139 is a professional grade horizontal pneumatic thermostat cover designed specifically for the T 4000 Series room thermostats. Engineered for demanding commercial environments, this white plastic cover provides a clean, uniform look for horizontal mounted controllers where a blank faceplate cover is required. As a genuine Johnson Controls replacement part, it ensures a precise fit for single or dual element sensing units