Ames backflow devices and preventers are the very best in the fight against backflow, and City Backflow Testing relies on them to protect your home and business

Terms used in articles on backflow testing. Air Gaps– Physical separation between a potable water system and a receiving vessel or source of contamination. Air gap between the outlet of the potable system and the flood level rim of the receiving vessel or any source of contamination must be at least twice as large as the diameter