Which of these steps would not be an acceptable solution to prevent cross connection from threaded faucets?

To understand why screwing a pipe onto the hose thread is not an acceptable solution for preventing cross connections from threaded faucets, it’s important to recognize what cross connections are and the role of proper plumbing practices in mitigating their risks.

A cross connection occurs when there is a potential for non-potable water or contaminants to enter a potable water supply. Threaded faucets often have hose threads that can easily be connected to hoses or other devices, creating a risk for cross connections if those devices are not properly equipped to prevent backflow of contaminated water.

Screwing a pipe onto the hose thread can create a situation where there is a direct connection from the non-potable water source to the plumbing system, which can allow contaminants to be siphoned back into the drinkable water supply. This connection provides no safeguard against backflow, particularly if there is a drop in water pressure, hence failing to meet the safety standards required for potable water systems.

On the other hand, filing or cutting the threads off can prevent the hose from being connected altogether, thereby eliminating the risk of cross connection. Installing an atmospheric vacuum breaker introduces a device designed specifically to prevent backflow by creating an air gap; it is an established method that safeguards against the risks associated with cross connections.