Kennedy Space Center Propellants and Life Support Branch

Generic Propellant Transfer Unit (GPTU)

GPTUs are multipurpose portable tanks. They are pressure loaded/offloaded using either helium or nitrogen as a pressurant gas. They can be used to directly load spacecraft when connected to a propellant control panel. GPTUs are made of 304L Stainless Steel and are insulated by virtue of there double-tank design (tank-in-a-tank like a cryogenic dewar). There are ten GPTUs and they are routinely available in MMH, MPH, HPH, and N2O4 low iron MON-3 service. GPTUs are available to commercial and DOD programs on a non-interference basis.