FS boxes are typically used for exterior applications. Code here doesn't allow PVC for exposed exterior use. If it's buried (some municipalities require concrete encasement) then it's OK.
Are you looking for something like this?
We went through a lot of discussion about terminology a while ago but basically the blue boxes are for interior applications and "gang" refers to the maximum number of devices you can get in a box. You can use a two gang box, install a single gang drywall ring on it and you have an opening in your drywall for one device with extra space in the box for terminations and such.
Here's the metal version:
4"x4" boxes are often referred to as 1900 boxes. Rectangular boxes as 8-B boxes. Weatherproof are often referred to as Bell boxes. Terminology depends on where you're from.
Hope this helps.
Are you looking for something like this?

We went through a lot of discussion about terminology a while ago but basically the blue boxes are for interior applications and "gang" refers to the maximum number of devices you can get in a box. You can use a two gang box, install a single gang drywall ring on it and you have an opening in your drywall for one device with extra space in the box for terminations and such.
Here's the metal version:

4"x4" boxes are often referred to as 1900 boxes. Rectangular boxes as 8-B boxes. Weatherproof are often referred to as Bell boxes. Terminology depends on where you're from.
Hope this helps.