6.8L CE Carbon Fiber Cylinder 4500Psi high pressure thread M18X1.5 Tank 6.8L CE Carbon Fiber Cylinder 4500Psi high pressure thread M18X1.5 Tank. Tags: 4500psi, carbon, cylinder, fiber, high, m18x15, pressure, tank, thread « DOT certified 6.8L 30MPA Paintball PCP tank Carbon Fiber air Tank with Valve Set