Grade R Twin Line Welding Hose, 3 8 in x 100 ft, BB Fittings, Acetylene and Oxygen no checkout or losing opacity Valve action mechanism or losing opacity Valve action mechanism prevents paint in barrel from drying when cap is left off Bullet tips are replaceable to assure complete use of paint in each marker Heavy duty aluminum body with large paint capacity powder free moisture control on the inside Beaded cuff to make donning easier and prevent roll down Ambidextrous for time and cost saving High quality Grade R twin line welding hoses Green hose carries oxygen to welding equipment Red hose carries acetylene Hose cover resists oils