JohnZ3 Posted May 25, 2019 Share Posted May 25, 2019 <b>Hello, I wanted to try out the black tank flush port today for the first time (using clean water on a previously emptied tank). I carefully read all of the instructions and reviewed the bathroom vent and drain diagram. Both reference a shutoff valve that must be opened before flushing the tank. I located the incoming water line under the front dinette seat, but there was NO valve anywhere. I then hooked up a hose and slowly added water which I could see (clear inlet hose) and hear water filling the black tank. When I opened the black tank tee handle at the rear, everything appeared to flush properly. My question is.....did the factory forget to install a shutoff valve or has there been a design change? I can cut in a valve, if needed. Thanks, John</b> John & Eileen 2018 F150 EB Super Crew FX4 2018 Oliver Elite II Hull #405 Link to comment Share on other sites More sharing options...
Moderators topgun2 Posted May 25, 2019 Moderators Share Posted May 25, 2019 The shut off valve you are looking for should be under the dinette seat fairly close to where that line enters the black tank. I'm not sure when the factory started adding that valve, but, I know that my Ollie (hull #117) does not have one. Given that there is a "check" valve on that line and all other signs seem to indicate that the flush worked properly - I would not worry about it. Next time you are at the factory you might want to ask about it or if it really bothers you, go ahead and cut it in yourself. Bill 2 2023 Ford F150 Lariat 3.5EB FX4 Max Towing, Max Payload, 2016 Oliver Elite II - Hull #117 "Twist" Near Asheville, NC Link to comment Share on other sites More sharing options...
Overland Posted May 25, 2019 Share Posted May 25, 2019 I do believe that they changed the design. There was a discussion here a month or so ago about it, and some trailers have both a check valve and a manual valve, and some only the check valve. edit - Bill seems to be a faster typer than me today. ;) 1 Link to comment Share on other sites More sharing options...
Moderators topgun2 Posted May 25, 2019 Moderators Share Posted May 25, 2019 Today? 1 2023 Ford F150 Lariat 3.5EB FX4 Max Towing, Max Payload, 2016 Oliver Elite II - Hull #117 "Twist" Near Asheville, NC Link to comment Share on other sites More sharing options...
ADKCamper Posted July 16, 2019 Share Posted July 16, 2019 I can confirm the above. We do not have a black tank flush valve either (Elite I hull#409 completed in late November 2018). That's good, because if we did it would be impossible to get to. I can see most of the tubing from where it enters the hull to where it enters the black tank with a flashlight and a mirror-on-a-stick, but most of it is buried under or behind the furnace and there is insufficient clearance to get a hand/arm into or around that space to operate such a valve if it did exist. The 2019 Owner's Manual (dated 1/8/2019) has removed the prior reference to this valve. See the "Oliver University" link under "Travel Trailers" above to download the latest owner's manual (now a single, merged Elite I and Elite II manual). Tom 1 Tom & Holly 2018 Oliver Legacy Elite I #409 - 2017 Silverado 1500, 5.3L Gas, 4x4 Z71, Dbl Cab, Std Bed Link to comment Share on other sites More sharing options...
BlaiddDrwg Posted August 16, 2019 Share Posted August 16, 2019 Page 75 of my 2018 owners manual shows this The Wanderer setup TV: 2018 Toyota Sequoia Trailer Options: Trojan AGM Batteries, 320w Solar package, 30 Amp Convenience pkg, 2000w Inverter, Omni-directional Antenna, Dakota Fiber-Granite, Opaque cabinet doors, Flagstone flooring, KTT mattresses, Inside Basement Access, Black Marble cushions, Anderson hitch, 30# propane tanks, Front and Rear Propane Quick Connects, Truma Tankless Water Heater, Micro Air, Storage Basket, Bike Rack, Additional Awning, Custom Graphics for the trailer name Link to comment Share on other sites More sharing options...
JohnZ3 Posted August 16, 2019 Author Share Posted August 16, 2019 Thanks for your reply. The illustration is very helpful, but my unit (#405) clearly does not have a valve there. Also, since there was a previous post from hull # 409 with the same findings, I'm guessing we were in the same class of not having one. Oh well. John & Eileen 2018 F150 EB Super Crew FX4 2018 Oliver Elite II Hull #405 Link to comment Share on other sites More sharing options...
Moderator+ ScubaRx Posted August 16, 2019 Moderator+ Share Posted August 16, 2019 To put this issue to rest, the factory stopped installing the valve in the black tank flush line. There is still a back flow preventer. 2 Steve, Tali and our dog Rocky plus our beloved Storm, Lucy, Maggie and Reacher (all waiting at the Rainbow Bridge) 2008 Legacy Elite I - Outlaw Oliver, Hull #026 | 2014 Legacy Elite II - Outlaw Oliver, Hull #050 | 2022 Silverado High Country 3500HD SRW Diesel 4x4 Link to comment Share on other sites More sharing options...
Geronimo John Posted September 13, 2020 Share Posted September 13, 2020 The only purposes for the black flush (BF) valve that I can think of are: If a jack ass wanted to, he could hook up a hose to your BF hose bibb and flood your trailer with poop while you are away. If the black check valve in the BF line were to fail, black water could end up on your hands when you remove the BF hose bibb cove. I would wager that a significant number of the owners leave it open anyway..... On the positive side, not having that valve makes flushing your black tank faster by not having to go inside to open/close it. Either way, the odds are so low that it would appear that the cost of the BF Valve was not worth the extra. 1 TV: 2019 F-150 SuperCrew Lariat, 3.5L EcoBoost, Max Tow, FX-4, Rear Locker OLLIE: 2018 OE2 Hull 342, Twin Bed. OLLIE DIY’s: Timken Bearings, BB LiFePO4's, Victron 712 Smart, 350 Amp Master Switch, Houghton 3400, Victron Orion DC - DC, 3000-Watt Renogy Inverter, P.D. 60-amp Converter, Frig Dual Exhaust Fans, Kitchen Drawer Straps. TV DIY’s: 2 5/16" Anderson System, Nitto recon’s, Firestone Rear Air Bags, Bilstein 5100’s, Mud Flaps & Weather Tech all, installed Ham Radio (WH6JPR). Link to comment Share on other sites More sharing options...
Mainiac Posted September 14, 2020 Share Posted September 14, 2020 Hull #211 a 2017 model has the valve. Only really open when winterizing and hand pumping antifreeze in. Does not get used much, if at all!. Link to comment Share on other sites More sharing options...
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