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135F (57C) Cover Plate for Tyco & Central Model A, Model 76A, Model AA, & Model A-1 Fire Sprinklers activates at 135F (57C) to facilitate timely activation of fire sprinkler heads with temperatures rated at 155F (68C) to 162F (72C).

This Grey-White 135F (57C) Cover Plate for Tyco & Central Model A, Model 76A, Model AA, & Model A-1 Fire Sprinklers is listed by UL and suitable for use with many discontinued Tyco & Central fire sprinklers, including Model A, Model 76A, Model AA, & Model A-1 sprinklers.Like all cover plates, when this grey-white fire sprinkler cover plate reaches a specified temperature the solder holding the plate's decorative exterior on the frame melts, and the two separate. When this grey-white fire sprinkler cover plate reaches a specified temperature the solder holding the plate's decorative exterior on the frame melts, and the two separate. 

For many cover plates, the rated temperature is at least 20F (6.7C) cooler than the sprinkler head's activation temperature, which ensures that the cover plate detaches early enough to allow the sprinkler to activate on time. However, each manufacturer's product line varies slightly and cover plate temperatures may be closer to or further away from the fire sprinkler's activation temperature. Use only the cover plate approved by the manufacturer for your specific sprinkler.