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I drain the grey tank through a 1" hose. That has not been a problem. Normally dump it on my driveway. The wild animals on our rural property dump far worse stuff on the driveway. No valves in the system or traps on the sink or shower drains.

When I return from a trip I dump the grey tank, plug the drain and then pump fresh water into the sink to rinse the grey tank. Add a small amount of bleach. Drive the van to let the water slosh around and then dump the grey tank a second time.

Always try to fill the fresh tank with city water that is chlorinated.
 

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Weight distribution vs. plumbing routing

As I play around with layouts for various components in a high top extended Transit I keep wondering about how to divide the heavy items in the build so you don't get too much weight on one side. Some VW Westfalias have a distinct lean to the drivers side because of the kitchen, and propane and water tanks -- all located on that side. Does it matter that much with these heavy duty haulers?

My initial plan was to keep wet bath, fresh water tank (inside), gray water tank (outside), kitchen sink all on drivers side to avoid crossing the van width with any plumbing. I want to keep all fresh water lines inside van to prevent freezing. I would try to locate batteries, inverters, stove, fridge, furnace, and VW-style propane tank on the passenger side to partially balance the weight of the water tank. That would mean crossing the propane lines under the van for the hot water heater.

If I moved the sink to the passenger side to be near the stove, would it be possible to route the gray water to a tank under the driver's side? Do others situate their components for routing plumbing or propane or just put stuff where they want it and figure out the routing?
 

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As I play around with layouts for various components in a high top extended Transit I keep wondering about how to divide the heavy items in the build so you don't get too much weight on one side. Some VW Westfalias have a distinct lean to the drivers side because of the kitchen, and propane and water tanks -- all located on that side. Does it matter that much with these heavy duty haulers?

My initial plan was to keep wet bath, fresh water tank (inside), gray water tank (outside), kitchen sink all on drivers side to avoid crossing the van width with any plumbing. I want to keep all fresh water lines inside van to prevent freezing. I would try to locate batteries, inverters, stove, fridge, furnace, and VW-style propane tank on the passenger side to partially balance the weight of the water tank. That would mean crossing the propane lines under the van for the hot water heater.

If I moved the sink to the passenger side to be near the stove, would it be possible to route the gray water to a tank under the driver's side? Do others situate their components for routing plumbing or propane or just put stuff where they want it and figure out the routing?
I made raceways under the raised floor to get hot & cold water and electrical to the other side of the van. They are insulated from the metal floor with 3/4" polyiso. I'm routing the passenger side galley sink drain back to a driver's side grey tank under the van.
 

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If I moved the sink to the passenger side to be near the stove, would it be possible to route the gray water to a tank under the driver's side?
My shower drain is on the driver side and the grey water tank is on the passenger side. Used 1" OD shower drain tube. Ran a 3/4" copper tube across van bolted to the van floor with 90 degree fitting on each end. The copper tube fittings are about 1" OD. Used 1" ID rubber hose with hose clamps for connection between the copper fittings and the shower drain tube. 1" rubber hose at tank end to connect copper fitting and tank 1" OD tubing.
 
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