Pipe corrosion from copper and galvanized pipe contacting each other is know as _______ .
When a pressure regulator creates a "closed system" there should be a _______ installed at the water heater.
When a fixture is above the sewer elevation and below the manhole elevation is should drain through a __________ valve.
The minimum air gap between the faucet outlet and the flood level rim of a bathroom sink is ___ inches.
In a shower the non-absorbent wall finish should extend a minimum of _______ inches above the drain.
Water heater temperature and pressure relief valves must be located in the upper ___ inches of the tank