This pertains to a Harris acteylene cutting torch. I remember when LP gas cutting was just starting to be used in cutting torches. The tips were always two pieces that slid apart for cleaning. I had always used one piece acteylene cutting tips. I bought another Harris acteylene cutting torch off of ebay and it came with a two piece tip. It is a size number 1. Immediately behind the 1 it has the letters AC. Like this - 1 AC . I am assuming there are two piece acteylene cutting tips now just like the lp gas tips are. I think lp gas tips might have been stainless steel?? Both pieces of this tip are the typical brass/copper color. Would sure make cleaning the tip easier. Thank you.