Thread: What is this

Looked at a Bosch dishwasher yesterday and there was no traditional air gap. Found the manual in a drawer and this pictured item wasn't part of the included parts with dishwasher. Is this some kind if air gap or anti back flow device that anyone can identify?
Thank for you help in advance.

Originally Posted by Scott Murdock

Looked at a Bosch dishwasher yesterday and there was no traditional air gap. Found the manual in a drawer and this pictured item wasn't part of the included parts with dishwasher. Is this some kind if air gap or anti back flow device that anyone can identify?
Thank for you help in advance.

My first thought. The drain pipe was short, and this was the first thing they found in back of the truck to make the connection.

Originally Posted by Dan Harris

My first thought. The drain pipe was short, and this was the first thing they found in back of the truck to make the connection.

There was plenty of pipe.

Not a clue. Did you see the back side?

Appears to be a one way valve.

Originally Posted by James Risley

Cannot see the top side too well but if that is an arrow on the top right of the brass in the picture which would indicate the flow direction of a check valve. Also cannot see enough of the hose which decends to the left but in the absence of a high loop in that hose, a check valve would be needed (unless the dishwasher has an internal check valve) to prevent back flow into the dishwasher from the disposal.

I saw nothing on the back side. There is no high loop and the manual shows it needs a air gap. Just had no idea what this brass thing is, a check vale or something but I guess I'll just call out no air gap and let the plumber deal with it.

Found this on the Nibco site.check.jpg

It's an in-line check valve.

Originally Posted by Joe Asta

Found this on the Nibco site.check.jpg

It's an in-line check valve.

Thanks, Is that acceptable in place of an airgap?

The manual says air gap....!!

Isn't the air gap created inside of the garbage disposal ?

"Isn't the air gap created inside of the garbage disposal ?"

Not if the disposal is backed up.

Originally Posted by walter bailey

]Isn't the air gap created inside of the garbage disposal ?

.
....
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Not to down play the requirement to report the absence of an air-gap, but has anyone ever tried blowing into the drain line of a dishwasher? I have and believe you would blow both eyeballs out of there sockets before forcing anything back into the dishwasher. I've tried several different brands and the ones I have tried all have check valves installed.
(I still report the absence of an air-gap or high loop)

Rick, what would qualify as an air gap? I'm not sure what the manufacturer is asking for.
I just assumed that so long as the water from the dishwasher entered the drain above the trap, the install was alright.

Thank you Billy.

"Not to down play the requirement to report the absence of an air-gap, but has anyone ever tried blowing into the drain line of a dishwasher? "

Most DW have a BF device built in.
That is why you cant blow in to the drain line.
DW with instructions that say to install air gap, most likely do not have BF device.
Air gap is perfered over BF device, everytime.

There are 2 air gaps or BF device on a DW.
1 for the supply and 1 for the drain
Supply is most often a built in air gap
Drain is most often built in BF device.