[QUOTE=Redwood;32758]It is an air-gap for the dishwasher drain.
Required by UPC Code to prevent water from a clogged kitchen sink line fron draining back into the dishwasher
NESTER YOU DON'T GET IT BUT A FOR EFFORT
YOUR MIXING A AIRGAP WITH A AIR ADMITTANCE VALVE THEY ARE TWO
SEPARATE THINGS ! !
A AIRGAP IN THIS APPLICATION IS JUST A AIR BREAK TO SEPARATE THE DRAIN THIS IS AS REDWOODS SAID TO PREVENT IF YOU HAVE A CLOGGED
DRAIN THE WATER WILL NOT RUN BACK DOWN INTO THE DISHWASHER WHERE
IT "COULD" CONTAMINATE THE WATER FILL VALVE AND YOUR "CLEAN" DISH'S PART ONE