April 23, 2007:
The point of connection between contaminated or polluted water and potable water is called a cross connection. Examples include a good well and a well with poor quality water connected together, a stock tank with a submerged valve or a garden hose submerged in a puddle or tank. The risk at the cross connection point determines the type of prevention assembly required. Options include hose bibb atmospheric vacuum breakers, dual check valves, and reduced pressure zone assembly backflow preventers.