The One Phase™ Piston Sampling Cylinder (OPC) is a patented, high-pressure cylinder designed for secure transportation and storage of hydrocarbon samples. Featuring a floating piston, integrated mixing ball, and machined-in valves, it ensures single-phase integrity with zero leakage risk. The NACE-approved stainless steel construction meets strict safety standards, while its compact design maintains full compatibility with standard PVT lab equipment.