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deep oxidation or cracks in the ceramic insulator require a full replacement to ensure the system operates within manufacturer specifications
flare connection
these are specifically sized for the lower pressure and higher flow requirements of natural gas heating systems
secure electrical connection
Johnson Controls T-4000-3139 Plastic Cover deep oxidation or cracks inThe 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
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