How do you winterize the black tank flush? I have a 2021 303RLS
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Winterizing Black Tank Flush
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From what I can tell, our black tank flush line travels vertically up to the vacuum break, and then back down to the tank. Because of this, and that there should be no long horizontal runs to hold water, I just use air to make sure it's clear. I have thought about buying a small hand pump to push some antifreeze through the line though.
Not to start the conversation about having a different hose for the black tank rinse and fresh water system, but I do have a separate blow plugs for the black tank rinse and the fresh water system. However, I have a separate hose that I use when dumping, that I know is not clean/sanitary since it has been used to rinse my sewer hose, and that hose end has been connected to the black tank rinse fitting. Because of that, I keep the two worlds completely separate.Last edited by StephenO; 09-20-2021, 03:34 PM.2019 Imagine 2400BH
2019 F150 XLT Super Crew, EcoBoost, 6.5' box, Max tow package with 3.55 ratio
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Originally posted by Dennis66 View PostHow do you winterize the black tank flush? I have a 2021 303RLS
Our Owners Manual does not state that winterizing the black tank flush connection/hose/back flow valve is necessary. Not certain what your manual states. Based on the design and installation (trusting the valve works as designed and there are no areas in lines where water can "sit") with our 303 and I trust most GDRVs, winterizing this s/n be necessary.
However, a few folks reported (not on GDRVs) that they had experiences on their prior RVs or heard of others who experienced possible frozen situations and thus broken back flow valves/lines/etc. As a result, I used this once and never used it again and have experienced no issues here in SD over 6 winters now.
Seems Rob Cate&Rob along with several others of us had a number of posts covering this good question over the years on the prior GDRV forum, not owned by GDRV. Maybe Rob will chime in or possibly others who may have feedback.
DanDan & Carol
2014 303RLS Reflection #185 (10/2013 build)
2012 Silverado LTZ Crew Duramax 2500HD - 2700/16K Pullrite Superglide
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I do not think that it is necessary to winterize the black tank flush line but it is necessary to winterize the outside spray port on the nautilus panel. Using the outside spray hose connected to the black tank flush line you could winterize the black tank flush line.
BrianBrian & Michelle
2018 Reflection 29RS
2022 Chevy 3500HD
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Dennis66
In "theory" the black tank flush line should not need antifreeze because it is supposed to be a downward slope all the way from the vaccum break to the black tank and thus should drain. In fact, this line often drops below the tank flush nozzle and thus creates a low point that will hold water.
Not wishing to restart the "two hoses vs one hose debate" . . . but , the black tank flush is a sanitary connection as long as you always treat it as such. I simply take my outside shower hose and connect it to the black tank flush while winterizing, to fill any low points in the flush line with antifreeze.
RobCate & Rob
(with Border Collies Molly & Angel + Kitties Hazel & Elsie)
2015 Reflection 303RLS
2022 F350 Diesel CC SB SRW Lariat
Bayham, Ontario, Canada
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