RAD64003333 Features: -Grade R Cut Length Welding Hose Is For Acetylene Gas Only. -RADNOR. -Economical Welding Hose for Applications With Acetylene Fuel Gas Only. All Grade R Hose Has Non-Oil Resistant Cover. All Grade R Twin Line Hoses Are One Continuous Length Of Hose. Grade R Twin Line Welding Hose Has A Smooth Cover And Grade R Single Line Hose Has A Corrugated Cover For Added Abrasion Resistance Welding Hose Cover Is Red For Acetylene; Green For Oxygen.. -If You Cut Or Heat With An Alternative Fuel Gas, Grade R or RM Welding Hose Is Not Recommended. Grades R and RM Hose Are Recommended For Use With Acetylene Gas only. Grade T Welding Hose Is Safe For Use With All Fuel Gases Including Acetylene. Purge Hoses When Not In Use For 30 Minutes or Longer. Couple With 1 Inch Long Ferrules Only. Failure To Follow Recommended Application Information Or Procedures Could Result In Fire Or Severe Personal Injury.. Product Type: -Hose or hose kit.