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Question DetailsAsked on 8/26/2016

How would you hook the dishwasher up without a garbage disposal?

If we take out the garbage disposal, where would we put the hose that comes from the dishwasher?

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1 Answer


It still needs to have backflow prevention - preferably an air gapper (required by law in most areas), most desireably at the sink/countertop surface so totally above any possible water level in the sink, though some areas allow it to be placed underneath the sink as high up as it will go. Some allow no air gapper (very bad idea in my opinion) and just looping the drain hose up as high as feasible under the sink or behind the dishwasher - though in that case it can allow backflow to the dishwasher out of the drain pipe when the dishwasher stops pumping out.

The end that would normally go to the garbage disposal drain barb (which is a poor design in the first place because the barb goes into the hose end, causing food particle and grease buildup) would instead go into a wye on the sink drain line. The wye should be on the drain (if double sink) with the cleanest water - not the one used to rinse off plates and such - and be placed at the highest feasible point on the drain line below the sink. For double sinks, above the trap on the left sink is probably the most common place - with the dishwasher drain hose hooking onto the stick-up branch of the wye.

Here is an image of how it is done - at right side of image - though note the dishwasher hose is NOT looped up as high on the back wall is it should be - you want the high point (with or without air breaker) to be as high as possible, so if the trap is flowing slowly or blocked yuou do not get backflow into the dishwasher. Also, the dishwasher hose should come into the drain in a downhill direction so it does not fill with water when the sink is emptying -

Also, I do not like the near-90 degree Tee like arrangement like that in the photo - I use a 30 degree Wye typically from Plumbshop - something like this 60 or 70 degree one but angled much higher upward so debris coming down the drain pipe cannot divert sideways into the dishwasher hose connection.

Come in ABS and PVC both glued and thread-and-nut connections, with and without barbed end for the hose to fit over and in a couple of sizes - commonly called an appliance wye or dishwasher wye. Home Depot and Lowes commonly carry several and adapters for different connection >

Answered 3 years ago by LCD

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