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2008 Navigator fuel/water separator sensor

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The filter is a Fleetguard FS19593 that has a screw on water canister on the bottom that houses the drain valve and the sensor. That is the reusable part that doesn't come with the filter.

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I am a little confused, as I think is Richard, perhaps others.  There should be (based on the ISL) two filters

Based on the ISL, Monaco labeled the "Particulate Filter" as PRIMARY.  The Secondary was the Water/Separator.

Look on page 267 of your manual.

Primary is Raccor 5323OP (ALPHA LETTER "O" and "P").  The secondary, or water separator is a Fleetgard FF-2200. There is also a diagram and explanation and servicing on page 257.

If you google the PN's they do NOT MATCH.  AND there is a few comments on IRV2. 

My BEST GUESS...using Cummins ISX Water Separator is this...

Fleetguard Separator Fuel/Water Spin On Part No: FS1242B

IF you pull up that on Amazon or any of the parts lists....that Separator SURE looks like the bottom of it is a 100% MATCH for your filter. Read the comments on page 257.

I won't place any bets...but I sure would order one and give it a shot...

Good Luck....

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