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Old 05-18-2015, 05:10 PM   #1
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Join Date: Sep 2010
Location: Saint John NB
Posts: 159
PT Lacrosse 301RLS Black Tanks

My 2012 Prime Time Lacrosse 301RLS has a Black Tank Flush system. After the winter it does not flush. Instead, water floods the bathroom floor from a black plastic device on some tubing located under the sink with the pump, winterization tubing, etc.
I don't know what this device does, when I apply black tank flush water it comes out of this device instead of flushing the tank ???.
I will fill the Black tank with water and an enzyme treatment to soak in case the flush bar / aspirators are plugged, but where is this tubing under the sink connected in the flush circuit??

Ken & Judy
2012 Prime Time Lacrosse 301RLS
2014 Ford F-150 Lariat - Max. Tow - Ecoboost
Hensley Arrow Hitch
Average 50-60 nights/yr
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Old 05-18-2015, 05:39 PM   #2
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Join Date: Nov 2011
Posts: 16,625
It's a 1-way check valve. Supposedly they're easy to replace or even remove entirely.

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Old 05-19-2015, 06:09 PM   #3
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Join Date: Mar 2015
Posts: 195
yep froze and cracked anti siphon valve
-2017 Ram Cummins, Aisin DRW 3.73, 4x4
-2015 Wildcat 317RL
-B&W Companion , MorRyde pinbox
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black, black tank, lacrosse, tank

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