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Scott Murdock
03-07-2010, 10:28 AM
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.
Dan Harris
03-07-2010, 11:50 AM
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. :)
Scott Murdock
03-07-2010, 11:56 AM
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.
Jim Luttrall
03-07-2010, 12:01 PM
Not a clue. Did you see the back side?
Raymond Wand
03-07-2010, 12:05 PM
Appears to be a one way valve.
Scott Murdock
03-07-2010, 03:14 PM
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.
Joe Asta
03-07-2010, 05:31 PM
Found this on the Nibco site.16667

It's an in-line check valve.
Scott Murdock
03-07-2010, 05:34 PM
Found this on the Nibco site.16667

It's an in-line check valve.

Thanks, Is that acceptable in place of an airgap?
Richard Stanley
03-08-2010, 07:18 AM
The manual says air gap....!!
walter bailey
03-08-2010, 07:01 PM
Isn't the air gap created inside of the garbage disposal ?
Rick Cantrell
03-08-2010, 07:04 PM
"Isn't the air gap created inside of the garbage disposal ?"

Not if the disposal is backed up.
Billy Stephens
03-08-2010, 07:14 PM
]Isn't the air gap created inside of the garbage disposal ?
.
....
.
Vern Heiler
03-08-2010, 07:16 PM
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)
walter bailey
03-08-2010, 07:17 PM
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.
walter bailey
03-08-2010, 07:21 PM
Thank you Billy.
Rick Cantrell
03-08-2010, 07:40 PM
"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.