... and specifications:1) B21 (stop valve): D20, D25, D32, D40, D50, D632) B33 (ball valve): 1/2" x D20, 3 ... , 1/2" x D50, 1" x D633) B29 (concealed valve): 1/2" x D20, 3/4" x D25, 1" ... , 1/2" x D50, 1" x D634) B30 (concealed valve): 1/2" x D20, 3/4" x D25, 1" ... water and mineral water4) Air conditioning facility pipeline5) Compressed gas pipeline networks for industry6) Pipeline network for swimming pool7) ...