How to install a spout
This sequence represents a common way of installing a spout on a swimming pool bond beam where there is simply a pipe projecting out from a wall and no access beyond the face of the wall. here's an example
Screw the fitting into the back of the spout. It probably should be sealed with some tape or pipe thread compound. Don't overtighten, you'll want to be able to move it about ⅛ of rotation in case the spout needs to be leveled.
Measure how much pipe is required. You'll be gluing the pipe fitting on to the pipe, so you need to figure out how far the pipe will need to stick out from the wall. Too far and you'll have an unsightly gap between the back of the spout and the wall. Too short and the spout won't be firmly attached. Measure twice and cut once!
Cut pipe to length. Just another reminder to "measure twice and cut once"
Attach the bonding wire Loosen the set screw ( a hex wrench is provided with each spout) and remove the small section of wire that shipped with the spout. Insert bonding wire and tighten the set screw.
Test fit & gluePlease consider sealing the back with some silicone. Glue it in place close to level
Level the spoutLevel the spout after the solvent glue has dried. You didn't overtighten the fitting and left ⅛ of rotation in case the spout needs to be leveled - right?
If you have access to the back of the wall on which the spout is mounted, then you have more options. You can use the threaded holes (¼-20) to mount the spout onto the wall. And since the back of the spout is threaded with standard pipe thread, you can thread a pipe directly into the spout.
It's important to note that the spout is designed for decorative use. It's not designed to support the weight of a human or any other object. If you are concerned with kids (or even adults) hanging off the spout and puling it off the wall, then please consult a qualified engineer. They can recommend various methods to secure the spout to a surface.
Also of note is that the spout is designed to be removed if there is a problem. In order for this to work it must be installed in a way that facilates this. So, obviously, mounting the spout onto a wall by epoxying threaded rod screwed into the back plate will make removal impossible.
These are technical drawings of the spout installation showing how the spout is installed in a context.