(The opinions below are those of a salesman, so…beware!)

GPO™ is a trademark of Gilbert Engineering who developed this connector.. A military specification was written so the defense dept would have multiple sources for this connector..Only Gilbert can call this connector the GPO, though other suppliers feel their connector is equivalent & call it the SMP.Minor tolerance differences exist, be carefull when substituting parts. Please call regarding your particular application, & compatibility between particular suppliers.