sunvalleyjoe
Have you noticed the kitchen sink drains slow when the shower drain is closed?I usually do not worry about it but seems sink is taking longer to drain. I have flushed the drain line from sink to outside drain port. It makes no difference. I am thinking maybe it needs a vent to help water drain faster.GBA!!SVJ
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gmwat
Hi svjoe
Yes our 155 had a slow drain that drove us nuts. We got a cheapo vent from amazon and put it under the sink and before the drain hose goes through the cabinet. It helped some but the problem ultimately was traced to a crimp in the hose at a tee near the gray water outlet .
Belts of luck

Glen 
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sunvalleyjoe
thanks for heads up I will look under the unit. Only problem with our 150 was inside shower dripping it is 2013. Had to replace valve. But no water leaks or soft floor thank God for that.We luv THE BOX got it very cheap and has all options except the hy-brid front bed. GBA!!SVj
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Tom
Yes.  It's a long and somewhat twisty run of that blue and white flex drain between the sink and outlet.  
Ours had a bit of a rise in it behind the cabinet under the fridge where that line exits the interior through the floor.  I think that rise was part of the problem.  
That line is going away, replaced with a new under the frame line and a small gray water tank.  
Hope that solves the problem.  I'll post a pic or two when finished.  
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sunvalleyjoe
been wanting to do same thing but have hard time getting under the trailer. Also no Retro dealer within 200 miles of Reno and other dealers wont touch them??GBA!!SVJ  
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Tom
Reran that sink drain line in hard pvc and it drains like a champ now.  
Kept the flex line down through the floor but 3/4" pvc after that.
Pic of the new gray water tank in a different thread:  http://www.riversidervowners.com/post/add-a-grey-water-holding-tank-8428496?pid=1305392267
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