The Series 4680 High Pressure/High Temperature Vessels are available with either a 1.0 L or 1.8 L capacity. These vessels can obtain temperatures up to 600 °C and a maximum pressure of 6000 psi (410 bar). The maximum pressure at maximum temperature is 4200 psi (290 bar) at 600 °C. A Split Ring closure with 12 Compression Bolts secures the head which allows a maximum of 8 openings. The Series 4680 Vessels can be configured with either a fixed head on a floor stand or as a moveable head vessel on a moveable cart. The fixed head versions allow the head (and the connections made to it) to remain in place while the cylinder and heater are lowered with the aid of the included pneumatic lift system.