... inlcuding pressure gauge,water motor gong, short pipes Wet alarm valve (Check valve) 1) Item no.: ZSFZ100, ZSFZ150, ZSFZ200 2) Nominal diameter: 100mm ... , 150mm, 200mmWet alarm valve (Check valve)1) Item no.: ZSFZ100, ZSFZ150, ZSFZ2002) Nominal diameter: 100mm, 150mm ...