Scuba Choice 33-Inch Kevlar Fiber High Pressure Hose for SPG 1st Stage&nbsp;Gauge For gauges, SPG, and 1st stage. Fitting tensile strength: 285kgf Working pressure: 5,000 psi. Burst pressure: 20,000 psi. Inner diameter: 3.5mm. Material: Nylon. Outer diameter: 8.2mm. Material: Kevlar Fiber TPU