Dishwasher plumbing question?
If I connect my dishwasher drain hose to the waste pipe under the sink, is the U-bend in the sink waste pipe enough to prevent siphoning, or do I additionally need to raise up drain hose as it leaves the dishwasher?
Your dish washer needs to be plumbed into your drain line as high up as possible above the trap, the U bend as you call it. If you have a garbage disposal there should be a fitting for where the dish washer connects right below the bottom of the sink. If you do not have a disposal unit then you can go to your local plumbing supply and purchase what they call a tail piece with a dish washer connection. The tail piece is the section of pipe that connects directly onto the sink drain pointing straight down and is 1 and 1/2" in diameter. the new piece will have a 3/4" tube coming out of it's side where the dish washer connects with a hose clamp above the trap. Keeping out all the stinky fumes from your sewage system and preventing drain water from making it's way into your dish washer.
Talk soon,
Joe Beaven
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Private parks Says:
Do the same as you would a washing machine.
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Posted on January 11th, 2009 at 9:41 am
andrew128354 Says:
you need to raise the waste hose from the dishwasher above the connection to the waste from the sink or yes as you say youll end up with your dishwasher full of the contents of your sink
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plumber 20 years
Posted on January 11th, 2009 at 9:51 am
Eamonn S Says:
The main reason for elevating the drain hose is to prevent, in the event of a blockage, sewage from entering the dishwasher and causing contamination, some states will permit you to, depending which code they enforce, elevate the dishwasher discharge as high as possible under the cabinet, however some do require the use of a vacuum breaker, I find the former to be more than adequate, as the sink would have to overflow in order to contaminate the washer, however,in the event of a home sale the latter may need to be installed to meet compliance for a C.O.
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Posted on January 11th, 2009 at 10:32 am
william r Says:
Your dish washer needs to be plumbed into your drain line as high up as possible above the trap, the U bend as you call it. If you have a garbage disposal there should be a fitting for where the dish washer connects right below the bottom of the sink. If you do not have a disposal unit then you can go to your local plumbing supply and purchase what they call a tail piece with a dish washer connection. The tail piece is the section of pipe that connects directly onto the sink drain pointing straight down and is 1 and 1/2" in diameter. the new piece will have a 3/4" tube coming out of it's side where the dish washer connects with a hose clamp above the trap. Keeping out all the stinky fumes from your sewage system and preventing drain water from making it's way into your dish washer.
References :
Posted on January 11th, 2009 at 10:51 am
jason c Says:
I would defiantly raise the drain hose as this will act to prevent both syphoning and the smell from the dishwasher.
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Posted on January 11th, 2009 at 11:06 am