Before revision: When installed and maintained properly, the air gap works as described above, and prevents drain water from the sink from backing up into the dishwasher, possibly contaminating URL Water flowing from the dishwasher into the sink indicates a need for maintenance or URL To further illustrate the air gap, consider what could happen if the air gap were eliminated by attaching a hose to the faucet and lowering the hose into a sink full of contaminated water.
After revision: When installed and maintained properly, the air gap works as described above, and prevents drain water from the sink from backing up into the fixture, possibly contaminating URL Water flowing from the dishwasher into the sink indicates a need for maintenance or URL To further illustrate the air gap, consider what could happen if the air gap were eliminated by attaching a hose to the faucet and lowering the hose into a sink full of contaminated water.