MAXPRO tubing is available in medium, high, and ultra-high pressure ratings: Medium Pressure Tubing. 1/4", 3/8", 9/16", 3/4", 1" with pressures to 22,500 psi. 1-1/2" with pressures to 15,200 psi. All diameters of MAXPRO stainless steel tubing are available at lengths ranging from 20-26.5 feet. High-Pressure Tubing.