The Dwyer 160S18 S-Type Stainless Steel Pitot Tube 18-inch Insertion Length is designed specifically for flow measurement of dirty, particulate laden air or gas streams typical in smoke stack and other environmental testing. Total and static pressure tubes are precisely aligned and welded together every 6 inches for maximum accuracy, strength, and long term durability. The 160S-18 Pitot tubes are designed to meet the need of the environmental testing field for an inexpensive, yet accurate and reliable way to measure the flow of particulate-laden air or gas streams. These pitot tubes use large 5/16˝ diameter stainless steel tubing for both total and static pressures to avoid plugging. Versatile 1/8in female NPT connections enable use with any type of piping or tubing. Two barbed tubing adapters are included for use with 3/16in I.D. rubber or vinyl tubing. The 160S-18 can be used in up to 1500°F (815.5°C) and 100 psig (6.89 bar).