Sounds like an island vent- see picture
You need to keep it, either in the wall or inside the cabinet.
In my area I can now use a mech vent(AAV), but only at island sink locations. You might consider the same, but do not just hook the trap to the drain line. That create an "s" trap which is prone to self siphoning, therefore, not allowed any more
You need to keep it, either in the wall or inside the cabinet.
In my area I can now use a mech vent(AAV), but only at island sink locations. You might consider the same, but do not just hook the trap to the drain line. That create an "s" trap which is prone to self siphoning, therefore, not allowed any more