Johnson Controls T-800-1011 Replacement Averaging Element, 15 ft Capillary / 8 ft Element, for T-800 T-900 T-8000 T-8500

Johnson Controls T-800-1011 replacement averaging element with a 15 foot capillary and an 8 foot sensing element, a direct replacement for the T-800, T-900, T-8000, and T-8500 pneumatic temperature controller families. Reference number 27-343-132.

An averaging element reads temperature along its whole 8 foot length rather than at a single point, which is what duct and plenum sensing requires: stratified air across a large duct cross-section would fool a point sensor, and the averaging capillary reports the true mixed temperature. The 15 foot capillary lets the controller sit well away from the duct.

These serve commercial HVAC pneumatic control systems - mixed air control, discharge air sensing, and coil freeze protection on air handlers - where the original Johnson Controls pneumatic loop is still in service and a failed element takes the control point out.

Used; unit looks good to us; clean coiled capillary with no visible damage. Sold as-is, surplus from King Surplus inventory in Del Rio, Texas. Same-day shipping on orders before 3:00 PM CT.

• Manufacturer: Johnson Controls
• Model: T-800-1011
• Reference Number: 27-343-132
• Additional label codes: E0025149, 9030
• Type: Replacement averaging element, pneumatic temperature control
• Compatible Controllers: for T-800, -900, -8000 and -8500, as printed on the factory label
• Capillary Length: 15 ft
• Element Length: 8 ft
• Application: Duct and plenum averaging temperature sensing, commercial HVAC pneumatic controls
• No separate factory serial number is carried on the label. Factory net weight and factory carton dimensions are not printed on the label and are not stated here.

Spec Basis: Verified 2026-09-16 against this item's own factory label photographs (Johnson Controls label, KSC record 4030), which read verbatim "REPLACEMENT AVERAGING ELEMENT / FOR T-800 -900 -8000 & -8500 / 15 FT. CAPILLARY 8 FT. ELEMENT / 27-343-132", cross-checked against Manufacturer (FID 56) and Model (FID 57). Every specification above appears on that label. The prior entry's "Dimensions (packaged): 2 x 4 x 10 in" and "Weight: 1 lb" were a copy of our own shipping measurements (FIDs 77, 78, 79, 80), not factory specifications, and have been rewritten.