Scuba Choice (SCMP-08) 33-Inch Kevlar Nylon Braided HP High Pressure Hose for 1st Stage&nbsp;Gauge, Black For gauges, SPG, and 1st stage. Fitting tensile strength: 349kgf Working pressure: 5,000 psi. Burst pressure: 22,000 psi Inner diameter: 3.5mm. Material: Nylon. Outer diameter: 8.7mm. Material: Kevlar Mono Filament