PTLOX PORTABLE LIQUID OXYGEN SYSTEM by ESSEX The ESSEX PTLOX PORTABLE LIQUID OXYGEN SYSTEM is a low pressure portable 10 liter liquid oxygen storage and gaseous delivery system also known as ESSEX CRYOGENICS CRU-87/U OXYGEN CONVERTER. About the PTLOX (FDA Life Support device 510(k) number K880183): Indicator Power runs on two (2) 9-Volt Alkaline Batteries Three (3) Schrader Quick Disconnect Ports...Read More