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Old 07-21-2009
Hisham Amaral Hisham Amaral is offline
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Join Date: Jan 2008
Location: LAs Vegas
Posts: 564
Default Air dryer (AD9)

Hello all

I am trying to change out the Bendix AD9 air dryer, the part store I deal with is asking if I have to get a 3/4" or 1/2" ports. Any help would greatly be appreciated. I know once the air dryer is of the coach it is not drivable.
Hisham and Sue Amaral
2006 M450 LXI (SOLD)
2004 Prevost XL2S 5 (Sold)
2003 H3-45 S2
TGO Titusville, Florida
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Old 07-21-2009
fxdwg fxdwg is offline
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Join Date: Mar 2008
Location: okc
Posts: 3,843


What are they referring to concerning the 3/4" or 1/2" ports? I just did mine last month and did not get any questions regarding port size. There is a newer version of the AD9 which has a spin-on canister which takes the place of the older housing and internal spin off dessicant cartridge. But you have to have the correct base to mate with the new unit, so you can't retrofit it. The other "change" that's occurred is a newer style pop-off valve, but the rebuild kit for it had both styles in it, so it's also a mute point. You should just get the dessicant cartridge and a pop-off rebuild kit. The cartridge will come with the couple of o-rings that need replacing. Not a bad job, but not the easiest either.
96 WTOS 42'

don't waste your time with a usa-spec ipod adapter- poor products with poor support
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Old 07-21-2009
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Randy Dupree Randy Dupree is online now
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Join Date: Dec 2007
Location: Port St Joe,Fl
Posts: 36,189

Hish, My parts guys just ask if the bottom is round or if it looks like a stop sign,mine is a hex,or stop sign,i have never heard of a port size making a difference.
email me at randy@randydupree.com only.

Randy Dupree
2000 LXI 43
Port St Joe Fl.

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