Leaking grey tank

[Ralph7]

  My grey tank has 2 cracks in the bottom, but if I leave the drain valve open no leak, it drains into the black tank( holds 40gallons).
  At present in Az. 30 miles east of Q.. Due to ongoing long term treatment , at this time not able to travel yet, possibly next year.
The tank is black plastic, holds appx. 30-35gal.
  I can make the situation work as is, am in a park, just need to dump often.
  Tank is approx29Wx38Lx8or 9D , drains out the center of the end
. This is in a 77  TMC  MC 8 , hound assembled in NM , by ?allisns??? AN redone by me.
  Thanks in advance!

[Scott & Heather]

Can you get to the bottom of it? You could (or have someone) plastic weld it if you knew the type of plastic. I'm guessing ABS?

[sparkplug188]

If your can't get it repaired, Plastic-Mart can custom make identical replacements.  I had them make custom water tanks for my Eagle.  They fit like a glove in an insulated compartment between the two fuel tanks.

http://www.plastic-mart.com/category/34/rv-holding-tanks