Need to add an 1/8" NPT bung to your custom turbo system or intake tubing? PPE makes it easy with our Billet Aluminum Couplers. Featuring high-quality billet aluminum tubing with wide shoulders and angled ends ensure a secure fit. Plenty of room for any clamp width. Perfect for turbo ducting, water meth systems, nitrous and gauge probes. Available in 2", 2.25", 2.5", 2.75", 3" and 4" OD x 5" lengths.