Dishwasher Drained into Standpipe

[skeezix]

The dishwasher drain under my kitchen sink used to be routed to a standpipe as shown in the image below.

​

I have since rerouted the dishwasher drain to the garbage disposal via the high-loop method and capped off the now-unused standpipe.

I was wondering why the dishwasher was plumbed into a separate standpipe in the first place???

 

[Jeff Handy]

Maybe local code required an air gap.

Or maybe there was no disposal, in the past.

 

[Jeff Handy]

I hope your actual setup didn’t have the electrical receptacle right under the standpipe.

Gee, what could go wrong with that? ️

Even if gfci, it could flood and short out.

 

[Geofd]

Some people don't do it that way because if the disposal is clogged it will back up into the sink another way it's done is using a dishwasher tee after the disposal 90