Those plastic caps are commonly used on threaded plumbing fixtures.
You can probably find them at a plumbing supply store or at a better
hardware store. The caps are to protect the brass threads and are
usually put on by torch rebuilders.

James

On Mon, 30 Jan 2006 08:43:00 -0800, Grant Erwin
wrote:

Most torches I've owned have 9/16-18 threads for connection to the welding hose
(RH for oxygen, LH for fuel). I recently bought a used torch which had little
red plastic caps over the exposed 9/16" threads. I thought that was a great
idea, protecting the threads. Anyone know where I can buy these little plastic
caps designed to fit over torch threads?

GWE
Seattle area