You will now need to install your barbs, take your first barb and thread it into the outlet hole. I know I’m working backwards but hey.
Hopefully you have made the hole for the barb small enough so that you will not be able to screw it in all the way by hand. If you are not able to by hand go ahead and use a wrench.
Tighten it all the way down so that it’s flush with the surface.
You can now go ahead and do the same with the other barb for the inlet. Again you should start by threading it in by hand.
Again if you have made the hole the correct size you will need to tighten the barb down with your wrench.
Tighten it down so that it is flush with the surface, you will need to be more careful with this one because the wall is thinner and can easily warp.
