In alt.home.repair, on Sun, 9 Jul 2017 20:32:51 -0400, Ed Pawlowski
wrote:

On 7/9/2017 5:49 PM, Stormin' Norman wrote:

I am not sure if plumbing code in all states require an air gap as
part of the dishwasher installation. For more information, see:

https://www.thespruce.com/dishwasher-venting-2718654


Air gaps are not required in AZ unless in certain commercial buildings
and high rise apartment buildings.

That is interesting Wayne, thanks. If it were me and if I had an
extra punch-out in the sink, I think I would install one regardless.


I wouldn't, just a loop. Had dishwashers for 50 years and no problems
without it. Anyone know of a problem actually caused by a DW that back
siphoned into the water system? Yes, it can get into the DW, but the
purpose of the air gap is to protect the domestic water supply.

I don't keep track of other people's problems, but I had a chicken bone,
the one next to the drumstick, stick in my airgap and iirc it kept the
DW from draining. I thought it was the pump, or the hose was clogged,
and it took a while to find the thin little bone.