The key to flash-stain-free walls is a little bit of ingenuity, but the cost of this is steep.
To start, you need a new stainless steel pipe, and you need to know how to solder it to a wall outlet.
Then, you’re going to need a tool for fastening the pipe onto a wall, such as a screwdriver or a bolt cutter.
You’ll also need a little glue, which you’ll put in the pipe before you’re done with the job.
And finally, you’ll need some solder.
A basic torch will work fine.
A more advanced torch would require a better torch, or a new pipe and a new solder.
If you’re building a wall for an indoor-only installation, you could also use a high-powered flash torch.