Product Overview Vortex Tubes Welded Stainless Steel Construction with NO Plastic Parts. Produce cold air from -50F for spot cooling or hot air to 230F from ordinary Compressed Air with no moving parts! Nex Flow Vortex Tubes are constructed of WELDED Stainless Steel and use a Generator and Valve made of BRASS and sealed with Viton O-rings to allow their use in the widest range of industrial environments. The unique design and quality of materials used in Nex Flow Vortex Tubes will deliver years of maintenance-free operation. Careful detail to holding critical tolerances, only precision machining can accomplish produces a Vortex Tube with the highest rated Cooling ( BTUHr ) in the industry and in stock ! Nex Flow Vortex Tubes are Dimensionally interchangeable with all other manufactures. Youll find many other cheaper Vortex Tubes on the market. Others use either BrazedStainless construction or AluminumPress Fit, both with PLASTIC Generators and standard Buna N O-rings. We invite you to compare the overall value of the Nex Flow Vortex Tube.