Keystonerv.com has an archive brochure site that will provide specifics on your unit. If not clogged, best approach is to either back flush or fill thru the toilet with a hose and re dump. With a clear back flush you can see when purged.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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