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11-19-2015, 04:25 PM
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#1
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Junior Member
Join Date: Dec 2014
Location: Union, MO
Posts: 6
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Black tank flush back flow location
Anyone familiar with the location of the black tank flush back flow valve on a 2015 28SGS 5th wheel?
It is not under the bathroom or kitchen sinks. I don't see another water line from the pass through going up into the bathroom except for sink, toilet and shower. Don't want to pull down under belly to trace the line if it can be avoided.
It sprays only for a few seconds and then there is a thump and it builds up pressure. We are done with it for the year however am concerned about freezing since it did not spray and may have residual water.
From my research on here and from what the local tech told me the back flow is likely the problem. Dealer will address under warranty but first opening is not until Jan.
Thanks
__________________
2015 Cougar 28SGS
2011 Chev 2500 reg bed 6.0 gas
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11-19-2015, 04:34 PM
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#2
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,996
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The 28SGS and the 27RKS have identical "top floor plans". That said, your black tank flush coupling is above the water heater on the road side. The 1/2" PEX tubing is routed from the sidewall directly to the hole in the vanity cabinet and up under the sink, then back down to the rear side of the black tank. If you open your vanity, look inside where the red and blue PEX lines (hot and cold water) are located, you'll also see two white PEX lines. They are the black tank flush lines. The anti-siphon valve is located up at the very top of the vanity, behind the sink and nestled alongside the faucet connections.
It's easy to miss, but get a good, bright light, move everything off the top shelf and you'll see it once you've got your head inside the cabinet with your forehead touching the drain.
Good Luck
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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11-19-2015, 05:36 PM
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#3
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Senior Member
Join Date: Apr 2011
Location: Arrey,
Posts: 2,368
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JRTH, Howdy;
Quote:
Originally Posted by JRTJH
The 28SGS and the 27RKS have identical "top floor plans". That said, your black tank flush coupling is above the water heater on the road side. The 1/2" PEX tubing is routed from the sidewall directly to the hole in the vanity cabinet and up under the sink, then back down to the rear side of the black tank. If you open your vanity, look inside where the red and blue PEX lines (hot and cold water) are located, you'll also see two white PEX lines. They are the black tank flush lines. The anti-siphon valve is located up at the very top of the vanity, behind the sink and nestled alongside the faucet connections.
It's easy to miss, but get a good, bright light, move everything off the top shelf and you'll see it once you've got your head inside the cabinet with your forehead touching the drain.
Good Luck
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You forgot to welcome "cdougmark" to the Keystone version of Circ de RV.
hankaye
__________________
Striving for a less complicated life since 1949 ...
Home: 2008 Cougar 278 RKS
T.V.: 2004 F-250 4X4, Level III BulletProofed , Detroit Tru-Track Differential (915A550)
Dog: 2006 Border Collie (Rascal) aka Maximum fur dispersal unit. (08/04/2006 - 12/16/2017) RIP.
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12-06-2015, 02:19 PM
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#4
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Junior Member
Join Date: Dec 2014
Location: Union, MO
Posts: 6
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Thanks for the response. Was able to locate 2 white water lines going up through floor above the water heater in same hole as the shower water lines. Assume back flow is in the shower wall, it is definitely not under the vanity. Due to major back surgery haven't had time to do any further investigation. Dealer says not to worry about freezing as any water should have drained. Dealer will repair any damage and test in Jan 2015 prior to warranty expiration.
__________________
2015 Cougar 28SGS
2011 Chev 2500 reg bed 6.0 gas
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12-09-2015, 07:47 AM
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#5
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Senior Member
Join Date: Mar 2013
Location: Wisconsin
Posts: 102
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Quote:
Originally Posted by JRTJH
The 28SGS and the 27RKS have identical "top floor plans". That said, your black tank flush coupling is above the water heater on the road side. The 1/2" PEX tubing is routed from the sidewall directly to the hole in the vanity cabinet and up under the sink, then back down to the rear side of the black tank. If you open your vanity, look inside where the red and blue PEX lines (hot and cold water) are located, you'll also see two white PEX lines. They are the black tank flush lines. The anti-siphon valve is located up at the very top of the vanity, behind the sink and nestled alongside the faucet connections.
It's easy to miss, but get a good, bright light, move everything off the top shelf and you'll see it once you've got your head inside the cabinet with your forehead touching the drain.
Good Luck
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Good to know information. Thanks John
__________________
2013 Keystone Cougar 28SGS Xlite
Shipping weight 7561 lbs
Carrying capacity 2439 lbs
Hitch Pin 1410 lbs
2008 Silverado 2500 Duramax 4X4 Crew Cab
Reese 16K Round Tube Slider
Custom 3 Receiver Hitch Scooter Carrier
2013 Honda PCX Scooter on the Carrier
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