Grey tank plumbing

[cncsparky]

Here is a pic of my grey tank outlet.  It goes from 3" to maybe 1.5" pipe then back to a 3" adapter for the dump.   Hm?   Is this typical?  Is the smaller line adequate to dump?



Also, does this look like its been repaired?  I'm sure I see cracks on the bottom of the tank near the outlet.  The cracks are pink, as in RV antifreeze colored  i?? .  But doesn't appear to be leaking, yet.

[Stripe]

Here is a pic of my grey tank outlet.  It goes from 3" to maybe 1.5" pipe then back to a 3" adapter for the dump.   Hm?   Is this typical?  Is the smaller line adequate to dump?

To quote the smartest man on Earth, "I don't know"..

Also, does this look like its been repaired?  I'm sure I see cracks on the bottom of the tank near the outlet.  The cracks are pink, as in RV antifreeze colored  i?? .  But doesn't appear to be leaking, yet.

It does look repaired in fact.  It might not look like a good repair job, but that could just be due to age. It could also be a bad repair. Have you tried filling the tanks with just straight water to test for leaks?

[cncsparky]

Last time we used it, about three years ago, no leaks.  I will put some water in there soon to test.  Thanks!

[Oz]

Here is a pic of my grey tank outlet.  It goes from 3" to maybe 1.5" pipe then back to a 3" adapter for the dump.   Hm?   Is this typical?  Is the smaller line adequate to dump?

I've never seen anything like that.  The tubing should be the larger size the entire way.  A restriction down to 1½" would really slow down the draining process.  Makes no sense to me. 

[Rickf1985]

Well that strange plumbing will leave quite a bit of water in the bottom of the tank to freeze. While I could see where the valve might break from ice the tank should have plenty of expansion room and Should not crack unless that 1 1/2 line goes in that far and could create an obstruction for the ice to leverage against.

[cncsparky]

Rick I didn't even think about a freeze problem with that setup.  So if this probably wasn't factory, any ideas why it was done?

[DaveVA78Chieftain]

If they share a common dump outlet, is it possible the black tank could have been draining back into the grey tank?  Solved by draining black then grey.

Dave

[cncsparky]

Dave I have two different dump outlets.  The black is in front of the duals, and this one is in the back of the rig. 

[DaveVA78Chieftain]

Well, it was a thought 

Dave