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11-10-2015, 11:32 AM
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#1
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Junior Member
Join Date: Aug 2015
Posts: 11
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Black Tank Flush
Hello all - One question about using the black tank flush valve; should I use the water pressure regulator on the hose I attach to the black tank flush connection? I have been using the lower pressure, but was curious how others hooked up. Thanks, Matt
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11-10-2015, 11:37 AM
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#2
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,890
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It seems to be a pretty even split between those that do and those that don't.
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Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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11-10-2015, 12:13 PM
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#3
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Junior Member
Join Date: Aug 2015
Posts: 11
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Quote:
Originally Posted by ependydad
It seems to be a pretty even split between those that do and those that don't.
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Thanks - This is our first one with an external flush location, and I'm a little concerned about allowing too much pressure and having a blowout. I've already had to stretch into a very unhandy place to fix a leaky water filter, and really don't want black tank issues...Matt
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11-10-2015, 12:14 PM
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#4
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,890
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For what it's worth, I haven't used a pressure regulator on my black tank flush in probably 200+ nights of camping (not that many flushes/dumps, of course).
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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11-10-2015, 12:16 PM
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#5
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Senior Member
Join Date: Jul 2014
Location: SW Missouri
Posts: 357
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I didn't used to use a pressure regulator, but have started to as I had a spare anyway.
The Black flush runs to what is basically a sprinkler head that lets water out, so it would probably take very high pressure to cause an issue. But since high pressure might damage something that's buried inside your Black tank (or a hose leading to it), it doesn't hurt to use one.
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2017 Open Range - Light 297RLS, BX1 Gooseneck
2014 Ram 2500 4x4 CCSB 6.7L 68RFE
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11-16-2015, 09:22 AM
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#6
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Senior Member
Join Date: Sep 2013
Location: Texas
Posts: 1,183
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Never have in almost two years. I figure the more pressure at the spray head the better but I could be wrong, time will tell.
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Joe & Beverly
2014 Ram 2500 CTD, CC, SB
2014 8289WS lifted
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11-16-2015, 10:10 AM
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#7
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,074
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I've never used one on my black flush either.
Being it's an open ended system (nothing to hold/build pressure) there isn't much chance you'll ever see a spike of pressure inside the flush lines high enough to create any problems. 'Maybe' with the chincy, plastic anti-siphon/check valve... but that's another topic.
Like was mentioned... the more pressure you can give it, the better the flush.
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2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2017 Ford F-Series SCREW 4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
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11-16-2015, 10:20 AM
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#8
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Senior Member
Join Date: Apr 2014
Location: Iowa
Posts: 1,413
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I never use a regulator on my black water flush. I have a 2 spicket faucet that I screw onto the campground water, one spicket has the regulator for city water, the 2nd one does not have a regulator and the black water hose is attached to it.
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Days camping (2016)----181 days
Days camping (2017) --- 82 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi, w/air suspension
30 years RV'ing
11 different RV's
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11-16-2015, 11:32 AM
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#9
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Senior Member
Join Date: Apr 2015
Location: Liverpool NY
Posts: 967
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I only use the black tank flush when the camper is home. My house water pressure is 80psi. Maybe the RV system can handle this pressure - and maybe not. I know I don't want to be screwing around with any black tank issues. I use a regulator.
I disagree that this is an open-ended system. Those little sprinkler openings by themselves will build pressure as they are restricting flow.
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Lar & Ruth
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11-16-2015, 11:51 AM
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#10
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,074
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Quote:
Originally Posted by CNYCamper
I only use the black tank flush when the camper is home. My house water pressure is 80psi. Maybe the RV system can handle this pressure - and maybe not. I know I don't want to be screwing around with any black tank issues. I use a regulator.
I disagree that this is an open-ended system. Those little sprinkler openings by themselves will build pressure as they are restricting flow.
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Sure they 'restrict' the flow somewhat but they wont build pressure or hold it when shut off unless your hose/supply is full of debris and clogs them.
It's open ended because there is nothing that closes off the water flow.
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2017 Ford F-Series SCREW 4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=86
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11-16-2015, 11:57 AM
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#11
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Senior Member
Join Date: Dec 2012
Posts: 7,645
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My FR installed black tank cleanout backflow preventer is rated to 125psi (mine is the clear plastic one). I think this is typical of all FR black tank cleanout installs (including the black plastic ones).
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11-16-2015, 01:04 PM
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#12
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Senior Member
Join Date: Oct 2015
Posts: 2,404
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Quote:
Originally Posted by RSchleder
I never use a regulator on my black water flush. I have a 2 spicket faucet that I screw onto the campground water, one spicket has the regulator for city water, the 2nd one does not have a regulator and the black water hose is attached to it.
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That setup should have a back flow preventer! 😨
Land of 10,000 Lakes
2016 Forester MBS 2401R
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2016 FR Forester 2401R
Towing 2014 Honda CR-V
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11-16-2015, 01:10 PM
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#13
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Senior Member
Join Date: Dec 2012
Posts: 7,645
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Quote:
Originally Posted by MNtraveler
That setup should have a back flow preventer! ��
Land of 10,000 Lakes
2016 Forester MBS 2401R
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There is a backflow preventer in line somewhere within the unit installed by FR. He was only talking about the external input to the flusher.
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11-16-2015, 03:11 PM
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#14
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Senior Member
Join Date: Oct 2015
Posts: 2,404
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Black Tank Flush
Just to prevent sewer going into the campground water system, or looping back into your own RV through the other spigot when it's directly connected through that dual spigot to the black water hose, that's all.
$#%t happens.
Land of 10,000 Lakes
2016 Forester MBS 2401R
__________________
2016 FR Forester 2401R
Towing 2014 Honda CR-V
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11-16-2015, 03:20 PM
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#15
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Senior Member
Join Date: Dec 2012
Posts: 7,645
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Ain't gonna happen. Backflow valve is probably 4 to 5 feet above black tank and besides only used when emptying tank. What's to loop? It's all potable water in the cleanout lines.
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11-16-2015, 08:56 PM
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#16
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Senior Member
Join Date: Oct 2015
Posts: 2,404
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This (see drawing). Because the sewer system has been connected to the city water system. Sorry but it's true as described.
Sewer isn't supposed to gush out the stack vent on the roof either, right?
Land of 10,000 Lakes
2016 Forester MBS 2401R
__________________
2016 FR Forester 2401R
Towing 2014 Honda CR-V
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11-16-2015, 10:28 PM
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#17
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Ambassador
Join Date: Apr 2015
Location: EBF NC
Posts: 281
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It's a direct connection, so no pressure regulator.
Quote:
Originally Posted by steveanson
Hello all - One question about using the black tank flush valve; should I use the water pressure regulator on the hose I attach to the black tank flush connection? I have been using the lower pressure, but was curious how others hooked up. Thanks, Matt
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I don't use a regulator because it's a direct connection in to the black tank. I like the high pressure flush I get all the crud out with one or two flushes. I checked my connection there is no pex joints to blow apart so I elected to blast the poop outta my black tank. I would read your owners manual regarding the feature, and then make sure it isn't a plumbed connection. If it has joints in line I would definitely follow the 35 PSI regulator. Anyway that was my rationale.
kk
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2016 Ford F250 Crew Cab 6.2 L w/Ride Rite Air Leveling System.
2017 Rockwood Signature Ultra Lite 8335BSS
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11-16-2015, 10:33 PM
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#18
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Ambassador
Join Date: Apr 2015
Location: EBF NC
Posts: 281
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That's just gross
Quote:
Originally Posted by MNtraveler
This (see drawing). Because the sewer system has been connected to the city water system. Sorry but it's true as described.
Sewer isn't supposed to gush out the stack vent on the roof either, right?
Attachment 94441
Land of 10,000 Lakes
2016 Forester MBS 2401R
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That diagram leaves a bitter taste in my mouth...
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2016 Ford F250 Crew Cab 6.2 L w/Ride Rite Air Leveling System.
2017 Rockwood Signature Ultra Lite 8335BSS
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11-16-2015, 10:57 PM
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#19
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Senior Member
Join Date: Dec 2012
Posts: 7,645
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Quote:
Originally Posted by MNtraveler
This (see drawing). Because the sewer system has been connected to the city water system. Sorry but it's true as described.
Sewer isn't supposed to gush out the stack vent on the roof either, right?
Attachment 94441
Land of 10,000 Lakes
2016 Forester MBS 2401R
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Actually, it's more like this dwg. The input to the tank is no more than 2 inches from the top. The dump valve is open when cleaning out so where does the water that you say may backflow come from?
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11-16-2015, 11:44 PM
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#20
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Senior Member
Join Date: Oct 2015
Posts: 2,404
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Quote:
Originally Posted by bubbles
Actually, it's more like this dwg. The input to the tank is no more than 2 inches from the top. The dump valve is open when cleaning out so where does the water that you say may backflow come from?
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The same place it comes from when it gushes out the top of the stack vent - from a closed BW tank which someone forgot to leave open and then got called to do something else urgently and then whoops someone ran the sink too and now your FW system is contaminated as is the line to the park water.
I'm sure you are quite careful and will turn off the spigot that is connected to the FW line during this process and never leave the BW tank closed or the flush unattended, for which we all thank you. Nevertheless.
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