Brass Vapor Pin® sampling device connects to ¼-inch sample tubing (typically Nylon or Teflon®) with softer tubing, preferably Tygon®. Brass Vapor Pin® is less durable than stainless steel, but they can be reused repeatedly with proper care. We recommend Brass Vapor Pin® devices for short-term installations, especially those installed in the stick-up configuration. Total length 3 1/2". Top barbed fitting is quarter inch in diameter.