The Series 160S “S” Type Stainless Steel Pitot Tube 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. Permanent mount (PM) models include a 1″ welded stainless steel sleeve and adjustable compression fitting with 1″ MNPT mounting threads.