You will be fine with those. Could have been just me. You can drive yourself crazy try to find the "best" deal online. Looks like it was a good deal to me. Good luck and post some pics on your project.
I got mine with no leaks, after putting thread tape on the screw in one. Mine is from the chickens, I think because the pressure is a little high from the size of the tank and the height it is at. I do not see any dripsor leaks when they are not using it. I have been adjusting my on/off...
They have since grown some so you just pull blocks out as need, although I have surface mounted one so I will always have something under them so you dont end up with a mud pit. Mine seem to get plenty of water from it but dont be shocked if you let them free-range and the first place they run...
I had 3 nipples for 6 chickens in the brooder and 3 in the run for the same 6 and tbey seem to use the same 2 all the time. I bought the red ones from QC supply, but I dont remember the item # but if I find it tomorrow I will let you know. I love em but dont feel bad when and if you let them...