This patented pressure reactor (12 mL ) is an affordable alternative for a Microwave Synthesizer. This Starter Kit will safely release internal pressure at 120 psi and reseal the tube. The kit contains all items needed for immediately use, including twenty-five sets of Pressure Tube-12mL and Septa-12-120psi. Max: 120psi. Optional High Pressure Adapter-1225 (180psi) and Septa-12-High sold separately.