HK Army HSTL Carbon Fiber Tank 68ci / 4500psi Black The HK Army HSTL Air System has been developed with performance and affordability in mind. The AeroLite system includes a 5-year hydro cycle and is available in many color options. Tags: 4500psi, 68ci, army, black, carbon, fiber, hstl, tank « Ninja Carbon Fiber HPA Tank 68/4500 SL2 PRO V3 Reg Blackout Black / Purple 2024 Road Glide Cvo St First Look »