First pic is of a check valve type thing I found under the bathroom sink. It screws on and will let air in the tank but not out.
The second is after I fixed the drain with a p trap. I used 1.5" abs pipe.
1- 45 degree fitting
1- screw apart p trap
2- couplings to tie it back to the old line up by the drain and down stream the new addition.
The rest of the pics are showing the vent lines for the grey and black run up the wall behind the toilet together. One can only assume that the come together as one topside there's only one vent up top on the roof.
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