Crankcase/Valve cover vent question

[jondf1988]

I had to order a new air filter hose and I don't know if it has the same nipple as my 150cc stock Tao Tao quantum. Mine has the Crankcase vent line and valve cover vent connecting to a T and then connecting to a nipple in the air filter hose. Is this stock configuration necessary? Most of the parts aren't showing a nipple on replacement Air filter hoses. Here are link to the pictures.

https://imgur.com/a/BHM2ZrW