Reak Kitchen tanks dump fix

Edd505 wrote:
Appreciate all the suggestions, I am no plumbing expert but the plumbing shop I use,owner is. They do not carry ABS and the nearest box store is 80 miles one way, joys of rural living. There is a hardware store with selective common parts.

1. I explained what I was doing at the local pluming shop, they set me up with parts. Being zero pressure I am not worried about glue failure. Yes it all runs down hill and after pulling dump valve the pipe drains. We have lived on septic tanks 40 years and not much beside water goes down the drain in gray tanks. With what ever residual water remains in the 1.5" drain pipe I don't believe freezing to be an issue, the slide valve is in the enclosed belly above the modification.
2. money was not and issue
3. The 1.5 PVC runs down hill into the 3"
But it runs up hill at the rolled up 45º joint
4. If it fails I'll post it, but I'm confident it will still be in place when I decide to trade.
I am not guaranteeing that it will fail, however I have seen too many PVC/ABS joints fail. I would never create one myself.
I am not advid DIY'er. I have done this stuff everyday since 1989.

I am not an expert but an avid DIY who lives rural, reads and goes to YouTube when I don't know how.
Youtube is a good resource, but it is not a substitute for actual experience. But it has created lots of youtube experts.
Lived at one time in a log home from standing dead on the property, off grid 8 miles from the county road. (that was a learning experience) I am almost finished with the 8th and hopefully last, full house remodel on a 1600 sq ft 3Bdr 2 bath. that had been a rental and goes on the market when done.

I'm not trying to be critical of what you did. What you did will work for the most part.
I am trying to show you ways to improve upon what you did. I consider direct ABS/PVC joint a no no. I have seen to many fail to have faith in the various all purpose transition glues. Use of a no hub coupling is a simple way to never need/use transition glues.
Rolling a pipe up is also a no no. It creates a trap in the pipe that will always hold water. The fact that it is in a rolling bouncing RV is in your favor, nevertheless we never deliberately trap pipes by installing them without the proper fall.
I'm not trying to convince you of anything. My comments are worth exactly what you paid for them. You can consider them useful or you can dismiss them as hogwash.
I am hopeful the world will keep spinning either way.