6290NX is the most common type of Harris style cutting tip for use with oxygen & LPG, propane or natural gas. Harris style 6290NX has a light preheat that will increase the time in which it takes the LP flame to cut steel. The 6290NX is a traditional two-piece cutting tip design for use with LP gas and has a flat seat as shown in the photo. Harris style 6290NX cutting tip will fit most modern Harris cutting torches. In most cases, the cutting tip is the only part that needs to be changed when you switch between acetylene & LPG, propane or natural gas.