I am installing a dishwasher in an island where there is no sink. put the trap in the basement below the sink and just have a short standpipe. An excessively long drain hose is more likely to clog over time and/or overload the dishwasher pump motor. I was then going to run the dishwasher drain hose into a fitting coming off of the trap. Install horizontal drains with a downward grade of 1/4" per foot. I've been reading about air gaps but if I don't have a sink or no outside wall nearby, an air gap seems wrong. In other words, is it possible to hook up the drain of a dishwasher without attaching the drain to the tailpiece of a kitchen sink? This is one hose that goes from the bottom of the dishwasher up as high as possible under the counter (must be higher than the bottom of the sink) and then down to the disposal or drain pipe above the trap. See our blog posts Can a dishwasher drain hose be connected after the sink trap (to the trap arm)? you must vent that trap. 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. I thought “wow”, that is really class, most people just connect the dishwasher drain under the sink. The air gap works by allowing fresh air into the drain hose if there is a backup causing negative pressure. Install a properly vented standpipe near the dishwasher, and connect the discharge tubing to that (follow local plumbing codes). I have plenty of room for a high loop on the drain hose. The last option is to run a drain line under the floor, and attach to the sink drain below the floor. dishwasher installation without sink hook up; Author: stevick1 (LA) My husband for some reason has decided that he will install the dishwasher without going through the cabinets to the sink. I have easy access to the drain from the sink (which is about 10 feet away) under the floor where the dishwasher is going. The incoming dishwasher drain hose connects to one fitting, while a secondary hose runs from the other fitting to the kitchen sink's drain pipe or garbage disposer. I would like to do this for several reasons: 1) Since the discharge would not be going into the p-trap of the kitchen sink, I believe the discharge would be completely silent. Re: Draining/venting a dishwasher, without a sink; Author: packy (MA) some local codes require air gaps and some don't. Electric is no issue I was going to use 2" PVC, install a trap and air gap at the top just under the counter top. The other option, is to discharge the dishwasher to its own drain. Mounted to the rim of a kitchen sink, the air gap's outlet intercepts and empties waste water from clogged drains before it can flow through the appliance's drain … I am installing a kitchen island without a sink and need some guidance as to how to hook up the drain. A dishwasher air gap is code in many jurisdictions, though some allow an alternative installation method. for an explanation of two common installation defects. and Can a dishwasher be wired to a kitchen counter small appliance receptacle circuit? If you install a dishwasher next to a sink then this all works great. Go under the floor. He plumbed a separate drain line and hot water source behind the space where the dishwasher is to be placed. The drain hose from the dishwasher went through the hole and connected to a PVC drain line up on the basement wall which eventually connected to the main drain line in the basement. Draining/venting a dishwasher, without a sink. 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