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| 124 mm high, 169 mm wide, 78 mm deep | | 203 mm high, 113 mm wide, 86 mm deep |
| 4 7/8 in. high, 6-5/8 in. wide, 3 1/16 in. deep | | 4.9 in. X 2.8 in. X 0.9 in. |
| 5 3/4 in. (146mm) x 7 3/8 in. (187mm) | | 8 in. high, 4 7/16 in. wide, 3 3/8 in. deep |
| Covers Chronotherm II | | large |
| medium | | Medium Cover Plate 5 in. high, 6 7/8 in. wide. Large Cover Plate 6 in. high, 8 5/16 in. wide. |
| mini | | small |
| Small Cover Plate 4 5/16 in. high, 5 1/2 in. wide. Medium Cover Plate 5 in. high, 6 7/8 in. wide. | | T87 Only |
| T874 Only |
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| Chronntherm IV T8600, T8601, T8602, T8611, T8624, T810, T822, T834, T841, T874, T800, T8001, T8011, T8024, T8090, T8095, T8190, T8195, T8196, T8411, T8424, T8501, T8511, T8524, T8635, T8665, TS8095 | | Chronotherm III T8600, T8601, T8602, T8603, T8611, T8621, T8624 |
| Chronotherm III T8600, T8601, T8602, T8603, T8611, T8621, T8624; C7189, T874 with Q674, T8195, T8090, T8082, T834, T822 | | Chronotherm III T8600, T8601, T8602, T8603, T8611, T8621, T8624; T8082, T8085 |
| Chronotherm III T8600, T8601, T8602, T8603, T8611, T8621, T8624; T874 with Q674, T8195, T8090, T8082, T834, T822 | | Chronotherm III T8611, T8621 |
| Chronotherm IV T8600, T8601, T8602, T8611, T8624 | | FocusPRO 6000, 5000; PRO 4000, 3000 |
| FocusPRO TH5220, TH5320, TH6110, TH6220, and TH6320 Thermostat | | FocusPRO™ 5000/6000 Thermostats |
| FocusPRO™ 6000, 5000; PRO 4000, 3000 | | FocusPRO™ TH5110 Thermostat |
| PC8900 | | PC8900, T8131, T8132, T8112 |
| PRO TH1000 and TH2000 Series Thermostats | | Q473A |
| T4051A | | T42, T92, T451, T498, T651, T4051, T6051, T6052 |
| T498 | | T498A-B, T921A-E |
| T7512 | | T7660, TP9600 Series, TP970, TP971, TP972, TP973, TP974, Others |
| T8034C | | T8082 |
| T8082, T8182 | | T8082,T8085,T8182,T8185,TS8085 |
| T8090 | | T8090, T8095 |
| T8090, T8095, T8190 | | T8090, T8095, T8190, T8195, TS8095, Y8095, Y8224 |
| T812 and TS812 Thermostats | | T8131, T8132, T8112D |
| T8190 | | T8195 |
| T822 | | T8400, T8401 |
| T8600 2000 Series, T8000, T8400, T8775 | | T8600, T8090, Others of similar size |
| T87 | | T87 and others of similar size |
| T87 EASY TO SEE models. | | T87, T8090, T8095, T8190 after date code 9427. |
| T87/Q539 Only | | T87/Q539, TP970 Family, Others of similar size |
| T874 | | T874 Family |
| T874/Q674 Only | | T874/Q674, Others of similar size |
| T87F2998 | | T87K, T87N, T8775 |
| Taco zone valves or R8184. | | TG501 |
| TG504 | | TG504,TG586 |
| TG509,TG510,TG511,TG512 | | TG586A1000 |
| TG587 | | TG587F |
| TH3000 Series, TH4000 Series, TH5000 Series, TH6000 Series, TH8000 Series, Others thermostats of similar size | | TH5000 Series, TH6000 Series, TH8000 Series, Others thermostats of similar size |
| TH8000 VisionPRO™ Series Thermostats | | The Digital Round T8775 |
| The Round® T87K and T87N Mercury Free Thermostats | | THX9000 Series Thermostats |
| TS8085A/TS8095A | | Used with PC8900; W8900 Comfort Control Center to allow telephone communication. |
| Works with TH114-AF-12VDC & TH115-AF-12VDC Master Thermostats | | Y8183D |
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