... alloy, chrome plating 3.DN15(1/2")DN20(3/4" fire sprinkler different type: pendant type, upright type, ordinary type, sidewall ... 5) flux coefficient: 80,115(6) large coverage glass bulb sprinkler(7) 20mm diameter model: T-ZSTX20(pendent): installed downward, protected ... in sidewall way. ZSTDY-68degree also known as concealing type sprinkler with a round cover outside which can help to maintain ...