That fitting is a pipe thread so yes, tapered. Tighten these well. I used Loctite thread sealant on my fluid connections. Some use thread tape but I chose a different path and it has worked well. I also did a test fit on almost every assembly just to make sure I understood how it all went together and that everything seemed right.
As mentioned before, be careful with the posts. Fragile little guys... ask me how i know...