Backflow prevention assemblies MUST be installed by a licensed journeyman tradesperson, who is recognized by the authority having jurisdiction, and inspected for compliance with local safety codes.
Backflow prevention assemblies MUST be installed by a licensed journeyman tradesperson, who is recognized by the authority having jurisdiction, and inspected for compliance with local safety codes.
防回流阀总成必须由有资格证书的熟练技术人员安装，安装人员必须通过有关主管部门的认可，并符合当地安全规程的要求。