Hi guys, I think this is easy but would be great if someone would confirm. Have a 3” toilet line and about 6’ downstream as the crow flies there is a sink drain that is vented, currently with 1.5”. Toilet is to the far left, lav is the drain on the right side.
I removed a wall that had another 2” vent for the toilet that was right at the capped pipe marked S for shower, there will be a shower hooked to the capped pipe and it will have its own vent on the other side of the room. Can I leave this as-is without increasing the 1.5” to 2”? I’m assuming that the went vent from the sink is allowed to vent the toilet and that it can be 1.5”. I can increase it if I need to just checking before I do. Thanks!