Model GL4110 and GL 4710 sprinklers have a low profile, yet durable design, which utilizes a 3mm frangible glass ampule (hermetically sealed) as the thermosensitive element. Another key feature is a specially designed deflector. Available in pendent and recessed pendent (shown) styles, both of which meet UL 1626. These sprinklers have a temperature rating of 155°F to 175°F and water working pressure rating of 175 psi. Maximum low temperature glass bulb rating is - 67°F.