Is this a Johnson tee?

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Old 11-05-13, 03:18 PM
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Is this a Johnson tee?

I was about to finish up the installation of my dishwasher drain. I went to unscrew the cap seen centre here:

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when I realized that it is glued together and I will have to cut and replace the right side of the system. Not a big deal.


When I returned with the correct pieces, I looked to the left of the trap and noticed a second drain opening at the bottom seen here that looks very similar and is not sealed with glue.

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I know that you are never supposed to install the dishwasher drain below the trap, so I figured that it's not meant for that. What is this second opening used for? Is it a Johnson tee? There isn't a 1/2" line on the outside wall like I would expect from a Johnson tee (unless they covered it with siding). Any thoughts?
 
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Old 11-05-13, 03:35 PM
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Looks like a cleanout to me.
 
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Old 11-05-13, 03:42 PM
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Yeah... clean out... The other one they probably had the DW tied in there.

The part going in the wall would be the vent... Should go up through the roof or tie into the main vent in the attic..

This is the proper DW connection using a DW tailpiece...

 
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Old 11-05-13, 04:24 PM
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This is a Johnson tee. Not a lot of places where it is accepted.

http://www.askmehelpdesk.com/attachm...ohnson-tee.jpg
 
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Old 11-05-13, 06:21 PM
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Ah thank you. I should have realized.


On a semi-related note. When I hook up the drainage hose from the dishwasher to the drain, how high is high, and where is the sink flood level when they say "attach hose in a high loop above sink flood level"?
 
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Old 11-06-13, 12:34 AM
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"High" is as high as possible. The "flood level" is where the sink floods over onto the countertop or over the side onto the floor. In other words, in most cases it is utterly impossible to get the "high loop" above the flood level because the loop can go no higher than the underside of the countertop.

If your LOCAL plumbing code allows the use of a Johnson Tee then the overflow from that fitting goes through the side of the house ABOVE the level of the countertop. If your local code does NOT recognize the Johnson Tee then you really should use a conventional air gap fitting.
 
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