Every potable water system that supplies a fixture, or tank, that is not subject to
pressures above atmospheric, shall be protected against back-siphonage by a back-flow
preventer.
The text above was approved for publishing by the original author.
받은편지함으로 가서 저희가 보낸 확인 링크를 눌러서 교정본을 받으세요. 더 많은 이메일을 교정받고 싶으시면:
또는