Plumbing a Kitchen Sink

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Old 12-13-05, 07:16 AM
ERMA
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Plumbing a Kitchen Sink

We purchased a home recently and are having new cabinets put in. I want to pipe the kitchen sink myself without a garbage disposal and hook up the dishwasher drain to the sink piping. Would like a diagram if anyone has one. This is a double sink and whoever did the drains before, was not a plumber nor a member of this site, from what the plumber said when we had the lines cleaned out.
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Old 12-13-05, 09:03 AM
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We could use some more info on what it is you have now. Why was it evident that the plumbing was not done by a plumber or a knowledgeable person? Double sinks use a "combination waste" that ties the two sinks together. Depending on the location of the sink, the two drains may meet in the center of the two sinks at a tee or on one end of the sink drain with a tee going to the trap and then into the drain in the wall. For a dishwasher install you need a dishwasher tee connector. It needs to be installed before the trap. I prefer to install it in the vertical drop between the sink and the trap. This assists in not having water back up from the dishwasher into one or both the sinks. You MAY (if required by local codes) need an "air-gap" installed in the DW drain. This prevents siphoning of the DW drain. Good luck.
 
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Old 12-13-05, 09:38 AM
ERMA
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The installer used rubber jumpers with hose clamps on the piping and on the second sink (or right sink) they did cut the neck properly to fit in the compression nut. I thought the tee before the trap was the right idea.
The main drain is not in the middle, but off to the side (under the right sink) exiting the house through the back wall.
 
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Old 12-13-05, 09:48 AM
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The rubber couplings MAY have been used because the installer didn't know how to cut the piping to correct measurements to hit the drain at the proper location. The rubber would allow a little "wiggle" to get it hooked up. They now make flexible drain lines and traps to acomplish this. I personally would not use them because they have ridges that will collect debis. This causes the piping to clog easier and you may get a smell if the flex piping is before the trap from this debris.
 
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Old 12-13-05, 11:18 AM
ERMA
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They must have wanted alot of "wiggle" because the pieces are 8" long. How do you feel about using PVC for the drain piping off the sink drains?
 
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Old 12-13-05, 11:27 AM
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Most of the new and replacement drain piping is PVC. No worry about rust and the interior is smooth so everything flows faster and easier. Great for drain lines. Be aware that most areas do not allow PVC for water lines, only CPVC. Good luck.
 
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Old 12-14-05, 03:55 AM
ERMA
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Thank you much! I appreciate your professional opinions. I will put the cpvc on my list.
 
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