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Old 06-24-2020, 08:43 PM   #1
Skoolie
 
Join Date: Jun 2019
Location: Lebanon, IN
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Year: 2003
Coachwork: AmTran
Chassis: International
Engine: DT466e/Allison 2000
Rated Cap: 65
convert 1 1/2 outlet to 3 inch sewer hose?

I have come to the conclusion that i will need a 2nd grey tank in addition to the primary gray and black tank due to the location of my kitchen sink. I have the tank, and the perfect spot to mount it. the question is how can i use the same 3" sewer hose when this 2nd gray tank only has a 1 1/2" threaded outlet. Would just putting a couple bushings/reducers on the outlet to get up to 3" make sense? is there something i'm missing?
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Old 06-24-2020, 09:41 PM   #2
Mini-Skoolie
 
Join Date: Apr 2020
Location: St. Louis
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Chassis: 2003 Ford E350
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Most any big box home improvement store will have PVC reducers that will get you there... Something like this:

https://www.menards.com/main/plumbin...560-c-8571.htm
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Old 06-24-2020, 09:43 PM   #3
Skoolie
 
Join Date: Jun 2019
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I was assuming that would be the route to take, thanks
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Old 06-24-2020, 09:54 PM   #4
Bus Nut
 
Join Date: Jan 2020
Location: Fraser Valley British Columbia
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Year: 2007
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Chassis: Freightliner
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Quote:
Originally Posted by cdrobbins77 View Post
I have come to the conclusion that i will need a 2nd grey tank in addition to the primary gray and black tank due to the location of my kitchen sink. I have the tank, and the perfect spot to mount it. the question is how can i use the same 3" sewer hose when this 2nd gray tank only has a 1 1/2" threaded outlet. Would just putting a couple bushings/reducers on the outlet to get up to 3" make sense? is there something i'm missing?
Can you get your new grey water discharge line close to your existing black tank discharge? In an rv situation the waste hose is connected to the black tank drain and then the grey water tank is released to rinse the bad black stuff out of your hose with only one connection. See attached Pic of what that connection looks like. image.jpg
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Old 06-24-2020, 09:55 PM   #5
Skoolie
 
Join Date: Jun 2019
Location: Lebanon, IN
Posts: 104
Year: 2003
Coachwork: AmTran
Chassis: International
Engine: DT466e/Allison 2000
Rated Cap: 65
Quote:
Originally Posted by Oscar1 View Post
Can you get your new grey water discharge line close to your existing black tank discharge? In an rv situation the waste hose is connected to the black tank drain and then the grey water tank is released to rinse the bad black stuff out of your hose with only one connection. See attached Pic of what that connection looks like. Attachment 45954
I'll be using that fitting for my primary gray and black tanks, but the kitchen grey is on the other side of the wheel well
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Old 06-24-2020, 10:20 PM   #6
Bus Nut
 
Join Date: Jan 2020
Location: Fraser Valley British Columbia
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Originally Posted by cdrobbins77 View Post
I'll be using that fitting for my primary gray and black tanks, but the kitchen grey is on the other side of the wheel well
I am doing the same thing, tanks on both sides of bus. Grey tank on passenger side can discharge 1.5" using an external macerater pump to pump over to the main dump fitting. In your case just tie in to 1.5" before the knife valve. Much nicer than dragging a sh*tty poop hose around the bus.
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Old 06-24-2020, 10:22 PM   #7
Bus Nut
 
Join Date: Jan 2020
Location: Fraser Valley British Columbia
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Year: 2007
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Chassis: Freightliner
Engine: C7 Cat
Yes I get that you are putting tank behind wheel on same side but still applies. Just pump forward over axle to discharge valve
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