We only had 18 on the other side of the sink small row house kitchen and i might not even have been able to fit an 18 dw with cover panel in there there is a 30 wide refrigerator adjacent so that location could not work.
Dishwasher drain not connected to sink.
Our layout includes a dishwasher that is around the corner from the sink separated by a lazy susan corner cabinet.
With the discharge waste pipe located in the cabinet beside the dishwasher you will probably have to add a vent cap code says basically if there is a trap it must be vented you can still use a p trap at this location with a vent as the dishwasher will retain water in the line and pump they never drain completely that would stop gasses should the p trap dry out.
When a dishwasher hose connects to a sink without a garbage disposal an air gap a small slotted cylinder often made of stainless steel is installed on the top of the.
The drain hooks up under the house with the sink drain.
No the dishwasher discharge must be connected before the trap.
Clean your sink s air gap.
I am a little concerned that he has not given enough consideration to the air vent.
He plumbed a separate drain line and hot water source behind the space where the dishwasher is to be placed.
Nonetheless there are some limitations to your dishwasher placement in terms of water supply and drainage.
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Standard dishwashers come with a 6 1 2 foot supply line and drain hose which will both need to be connected to your water mains supply which is usually found under the sink.
Not going to the sink through the cupboards.