Flexible dishwasher drain options

[frogdude13]

What is the best legal flexible dishwasher drain option to install into a wall? This is for a multifamily building in Washington state. The objective is to find an easy way to get the waste to a sink drain on the other side of the kitchen. We're hoping to use something flexible since we need to get it through the wall studs that are already in place.

Here are a couple options that I've looked into and the issues that I believe exist with them. Maybe someone here can tell me why they will work or suggest a better alternative.

A) EPDM (rubber) hoses: These are sold for dishwasher discharge but I don't see this material listed as an acceptable drainage material under section 7. It's possible that I'm not looking in the right place though. If it's a questionable material then I am assuming the inspector wouldn't approve it.

B) Polyethylene: It appears to be an approved material.
- Black poly seems to be for cold only as best I can tell since there aren't any temperature ratings on product specs.
- Yellow poly looks like it would work based on product specs and availability EXCEPT for the yellow (gas) color.

How would you handle this?

 

[Jeff H Young]

id run it through the cabinets same as usual

 

[Sponsor]

 

[frogdude13]

id run it through the cabinets same as usual

I like that idea for the area with cabinets. The drain needs to run inside of a wall without cabinets before it gets to any cabinets though. Here's the basic layout:

Any ideas for this?

 

[GReynolds929]

You either need to run a proper drain over to it or like jeffh says run rubber hose through the cabinets.

 

[Jeff H Young]

Ive never had one like that, Im wondering if a high loop at the d/w then down below floor with copper and run to K/S area and tie in per code washington I think requires a air gap or johnson tee

 

[frogdude13]

Ive never had one like that, Im wondering if a high loop at the d/w then down below floor with copper and run to K/S area and tie in per code washington I think requires a air gap or johnson tee

We aren't able to go below the floor but we could run it through the wall.

Would polyethylene pipe work instead of copper? Flexible pipe would be a lot easier, especially since this is in multiple units.

 

[frogdude13]

Seems like a better flexible in-wall drain option might be to just use PEX, as covered here already:

3/4 PEX for dishwasher drain hose

I have a bunch of left over 3/4 PEX and would like to use some for a dishwasher drain. First, is it ok to use PEX for a dishwasher drain? Second, is there a best way to adapt to both ends disposal and dishwasher.

terrylove.com

If I'm missing a better option or am likely to fail inspection --> please reply now.