Red Crewzer Posted December 6, 2017 Report Share Posted December 6, 2017 I have a Macerator system on my motorhome and there is what looks like a bypass fitting between the drain shut offs and the pump. There is a hose that connects from this bypass to the smaller hose exiting the coach. Is this something that is necessary? Presently I leave this bypass open when sitting so the gray tank will drain constantly. I then close it when I am ready to pump the black tank. My question is: Is this bypass necessary? If not, will the gray tank still drain constantly if I leave the gray valve open all the time and just drain through the pump? I am having a leak problem and need to replace the hose between the drain valve fittings and the pump. I am having issues finding a replacement hose for this application. Any idea where to look? Already looked at all the supply stores (Home Depot, Lowes, etc). 2008 Tiffin Allegro Bus 43 QRP2006 Honda CR-V Link to comment Share on other sites More sharing options...
Biker56 Posted December 6, 2017 Report Share Posted December 6, 2017 I close the gray tank 2 days before dumping the black tank. I use the bypass 24/7 all the other times. Do you have the portable pump or the box pump? Is it the short hose from the outlet to the pump? That is probably the standard sewer hose size. Just heavier hose then standard. Full Time since Oct. 199999 Discovery 34Q DP | ISBDatastorm | VMSpc | Co-Pilot Live | Pressure Pro2014 MKS Twin Turbo V6 365 HP Toad Link to comment Share on other sites More sharing options...
Red Crewzer Posted December 6, 2017 Author Report Share Posted December 6, 2017 This was the only way I could get my picture posted for showing. Do I need the bypass valve? I will be replacing the black connecting hose as is leaking. Just need to find where I can purchase the black hose. Any ideas? 2008 Tiffin Allegro Bus 43 QRP2006 Honda CR-V Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted December 6, 2017 Report Share Posted December 6, 2017 Are you talking about the bellows type hose? That might be coach specific. Or at least they could get you a part number that could be cross-referenced. Another option would be to call the macerator company and see what hoses they supply with their kits. Sani-con, for example, has the bellows type hose with their permanent install set up. http://www.thetford.com/product/sanicon-system/ Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
jcussen Posted December 6, 2017 Report Share Posted December 6, 2017 Can't see any reason for it. I also have a macerator system and do not have the small hose with the valve on it. Edit. If you are leaving your gray tank open, would check that gray water will flow thru pump when pump is off, this might be reason for bypass. Foretravel 40ft tag 500hp Cummins ISM 1455 watts on the roof, 600 a/h's lithium in the basement. Link to comment Share on other sites More sharing options...
lockmup68 Posted January 7, 2018 Report Share Posted January 7, 2018 Doesn’t your washer drain into the gray tank or only into the pipe? In my coach, the washer does not go into the gray tank and you have to have the bypass in order to use washer. 2003 International Eagle 9200i, Cummins ISX, Freedomline 2007 Teton Scottsdale XT4 Link to comment Share on other sites More sharing options...
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