Here is a link to Steve's posting on the back flow check valve. Both this link and the one Jimcol posted have pictures of the valve.
http://www.montanaowners.com/forums/showthread.php?t=39046&SearchTerms=check,valve,bla ck,tank
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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