Use the nptf/m column for choosing the pipe size.
The other sizes to te left refer to the qd style. always look at the top of the column for the dimension key relating to te drawing they supply. in this case the sizes to the left refer to the nipple size on the end of the fitting. thatsnte part that fits into the disconnect fitting, not the hose. there a few different versions and shapes of them used commercially for pneumatic lines and air tools.
Regardless the ones on that page arent for paintball, you need 1/8 npt as everyone said. buy them on here or from air soldier.