SPT-8" - The SPT is an aluminum pitot tube that may be used to measure the static or velocity pressure in ducts.  The SPT has a 4" long insertion length and can be used to measure the static pressure in the duct. Pitot Tube for sensing static pressur length 3.5". The SPT is also available in 3.5".  The SPT Series are covered by ACI's Two (2) Year Limited Warranty.