
Devices to prevent pollution by backflow of potable water - Air gap with non-circular overflow (unrestricted) - Family A - Type B
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專家解讀視頻
Devices to prevent pollution by backflow of potable water - Air gap with non-circular overflow (unrestricted) - Family A - Type B
出版:German Institute for Standardisation (Deutsches Institut für Normung)
專家解讀視頻