422 Part numbers and illustrations are for identification only © 1971 - 2010 w.d. armstrong corp DIRECT REPLACEMENT DEFROST THERMOSTATS GL2690 OPEN 70°F CLOSE 12°F OPEN 50°F CLOSE 25°F GL3084 OPEN 75°F CLOSE 40°F OPEN 55°F CLOSE 35°F OPEN 78°F CLOSE 25°F GL6792 OPEN 60°F CLOSE 20°F GL8366 OPEN 40°F CLOSE 10°F GL8510 OPEN 45°F CLOSE 25°F GL8513 OPEN 47°F CLOSE 15°F OPEN 80°F CLOSE 31°F GL8519 OPEN 55°F CLOSE 15°F GL8515 OPEN 80°F CLOSE 15°F GL8517 GL8528 GL8509 GL5709 GL2697 3-Wire GL5708 OPEN 40°F CLOSE 15°F OPEN 47°F CLOSE 22°F Part No.   Open  Close  Tube SL10010   55°F 25°F 3/8” SL50112   72°F 25°F 3/8” SL50122   60°F 28°F 3/8” SL50124   72°F 28°F 3/8” SL50129   50°F 20°F 3/8” Part No.   Open  Close  Tube SL6155 45°F 18°F 3/8” SL7490 48°F 18°F    5/16” SL7500 72°F 28°F 3/8” SL7503 40°F 10°F    5/16” TUBE MOUNT PUSH-ON