FredH
Platinum Member
Normally when merging into a existing line , A " Wye " is used . Rather than use a 45 or 90 , I would use Wye's , thus You are also adding a clean out at same time .

This is how I added a RV drain to my existing system years ago . Main Line ran East / West , with RV line running North / South . 2 Wye's , with 2 plugs and with the 4"
line , It will handle a full flow RV tank dump with out any issue's .
Fred H.

This is how I added a RV drain to my existing system years ago . Main Line ran East / West , with RV line running North / South . 2 Wye's , with 2 plugs and with the 4"
line , It will handle a full flow RV tank dump with out any issue's .
Fred H.