Tyco horizontal sidewall sprinkler TY3338 (Series DS-1) 5.6K quick response (3 mm Bulb) and Extended Coverage, are decorative glass bulb automatic sprinklers typically used where the sprinklers and/or a portion of the connecting piping may be exposed to freezing temperatures; for example, horizontal piping extensions through a wall to protect an unheated area of a building. TY3338 designed for extended coverage use in light hazard occupancies.