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Old 03-22-2014, 11:32 AM   #31
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The 571 vent is to be installed above toilet level, in a area where it can vent water, during normal use, per mfg. Some are in the bath, kitchen sink, in furnace w/h compartment, etc. Goggle this vent, and you will find a three or four year history of failure, in several brands of rv's. If it totally stops working, water will spill out full force, and will flood the unit. While standing outside the unit, doing a real good job of flushing my black tank, I realized there was a real problem, when water started dripping from the floor. Yes, the black valve was open! Jayco service will give a" ho-hum" response, and b and b mfg will send you a new valve. I chose to remove the valve, period.
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Old 04-27-2014, 06:44 PM   #32
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The valve b and b sent me was stamped 688-F, It is a water inlet valve w/screen and has a built-in check valve that prevents water from pushing back from black tank to park fresh water system. As I stated, I bought a cheap plastic backflow valve at my local hardware/pluming store, that screws onto the end of my hose to tank flush. To install the 688-F would take about 5 mins standing on the outside of unit. It looks like a solid piece to me, and I plan on installing it.
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Old 04-28-2014, 09:00 AM   #33
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Took the maiden voyage with my Eagle last week, and all went well. Before leaving, I wanted to dump the tanks and flush the black tank. The Drain Connection and Valves are near the middle of the trailer, while the Black Tank Flush connection is near the end. So, after dumping the tanks, I had to pull the trailer up about 12' to get the campground flush hose near the flush connection. Needless to say, I had to close the tank valves and unhook the slinky in order to do that. After reading this thread (and others), I only let the water run into the flusher for about a minute. Then I unhooked, backed up, reconnected the drain hose and dumped. I repeated this process twice, and was amazed at how much stuff came out each time (I have a clear drain elbow to monitor the flow)! Now my black tank sensor actually reads empty!

BTW, the Charmin Ultra-Soft seemed to dissolve pretty well, but stay away from those "flushable wipes". You know, the ones where the lady is taking a shower with her clothes on, and not using any water. While they say they are septic safe, they do NOT dissolve AT ALL! Temporarily plugged up my valve and the strainer on the dump before things finally broke through and flowed freely. Just a word of warning!
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Old 05-22-2015, 06:21 AM   #34
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Exclamation Tank Flush

Make sure to check the inside connection of the tank flush before you turn on the water, mine DID NOT have anything connected, simply an open hole to the under sink and cabinet area, made a terrible mess and of course didn't realize it until gallons of water began to run out from all under the trailer.
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Old 04-03-2016, 08:21 PM   #35
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I disconnect the city water, make sure my water pump is OFf. Then after my black tank is done emptying out, I close the tank flush valve, I turn on the water on (I have a shutoff valve right at the connection where it connects to the rear of the trailer) then I grab a flashlight and go inside, open the foot pedal and watch the tank start to fill, I also watch it swirl around in there as well and can see TP and other stuff swirling as well. When it gets about 1/2 full, I go outside and open the flush valve and empty the tank, close the valve, go back inside and watch thru the toilet bowl and watch the water swirl until it gets about 1/2 full. back outside and empty the tank again. Usually, 3 times gets the tank clean. I have a clear elbow on the tank flush valve so I can see what is coming out. Never had any issues. By the way, my family knows not to distract me while I am doing this.
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Old 04-03-2016, 08:42 PM   #36
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Originally Posted by RAurand View Post
snip... I turn on the water on (I have a shutoff valve right at the connection where it connects to the rear of the trailer) then I grab a flashlight and go inside, open the foot pedal and watch the tank start to fill, I also watch it swirl around in there as well and can see TP and other stuff swirling as well. ...snip
Excellent idea! I've followed a similar process (dump, flush with dump closed, dump again; repeat 3 times), BUT I've never looked in the black tank while flushing. I just watched what flowed out of the tank through the clear elbow, but had no idea how much I was adding into the tank through the tank flush.

Dumping those tanks is not something I enjoy, but having a better idea of how thorough the flushing is could head off nasty problems. This season I will give your method a try.
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Old 04-05-2016, 08:33 AM   #37
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Excellent idea! I've followed a similar process (dump, flush with dump closed, dump again; repeat 3 times), BUT I've never looked in the black tank while flushing. I just watched what flowed out of the tank through the clear elbow, but had no idea how much I was adding into the tank through the tank flush.

Dumping those tanks is not something I enjoy, but having a better idea of how thorough the flushing is could head off nasty problems. This season I will give your method a try.

IMPORTANT>>>>> Just be careful not to drop the flashlight down into the tank. I tie a string around the flashlight and attach it to my wrist.
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Old 04-05-2016, 09:12 AM   #38
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Originally Posted by Brownie View Post
Took the maiden voyage with my Eagle last week, and all went well. Before leaving, I wanted to dump the tanks and flush the black tank. The Drain Connection and Valves are near the middle of the trailer, while the Black Tank Flush connection is near the end. So, after dumping the tanks, I had to pull the trailer up about 12' to get the campground flush hose near the flush connection. Needless to say, I had to close the tank valves and unhook the slinky in order to do that. After reading this thread (and others), I only let the water run into the flusher for about a minute. Then I unhooked, backed up, reconnected the drain hose and dumped. I repeated this process twice, and was amazed at how much stuff came out each time (I have a clear drain elbow to monitor the flow)! Now my black tank sensor actually reads empty!
You will find it much easier to take an old section of hose that you probably have around the house and use it solely as your black tank flush hose. Just connect it to the BW rinse hose at the dump station and you are good to go. We just have a small separate tote we throw it in. It doesn't need to be very long (just about 10-15 feet or so). So if the old hose you have at your house is longer, just cut it down and add a fixture on the end.
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Old 04-05-2016, 09:13 AM   #39
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On the last day in camp, I'll dump, then run the BT Flush for a few. Then close the valve and let her fill. Watch the idiot lights inside closely, then run around and turn off the water. Open the valve and let 'er whoose. Might do it again if the DW has decided to not get too excited about her part of closing down.
I'm unsure of the spray pattern it uses for flushing, but since the only other way to refill the tank for a second big flush is to run the toilet (and perhaps also point the shower into it), this seems to be the only practical solution without dragging hoses inside. On mine, when the last "tank full" light comes on, I still seem to have plenty of time to get to the hose bib to turn it off.
So far, never any issues.
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Old 04-05-2016, 11:46 AM   #40
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When I am back flushing with the black water valve, I listen closely to the sound of the flush spray hitting the sides of the tank, Initially it is quite loud, but as the tank fills up it becomes increasingly quieter. At the point that the noise is almost disappeared, I open the black water valve. I have learned that when the noise of the flush hitting the tank walls almost disappears, the tank is about half full. Like RAurand said. Don't bother me during this flushing process.
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