Dunbar. In Oz we are required to discharge the dishwasher waste with a high loop & then either to a tit above the water seal of a trap or over a tundish connected to a trapped drain, we have no requirement of length. thus a air gap in the latter case.
I suppose the tit over the water seal forms an air gap, however it is not a clear air gap & under a blocked sink scenario it would be a problem, but then you couldn’t use the sink any way.
In Oz we also dont get the rate of DIY as you do in USA either. It seems that the US Constitution gives the individual the right to do whatever in their own home with no thaught of the consequences to the community services.
It seems to me that the USA has to give up some of its individual rights in an effort to curb DIY. Especially in Plumbing as this is the centre stone of the HEALTH OF THE NATION.
Bob
