Description Heavy Duty Airline – Black Dreamworks Heavy Duty airline is now available in nine different colors. Tested to 160psi this airline offers longer life and greater reliability; resists abrasion and chaffing. Will not slip off cylinder nipples or Tee fittings. Without question, the highest quality airline we could offer. Sold in 12' lengths. Tubing Specifications:     Color: Black     Outside Diameter: .125 or 1/8     Inside Diameter: .066 or 1/16