306 that has been configured to include a recess or indentation 304 as stated above the recess or indentation 304 is configured to fix the orientation of the rfid transponder 302 and to provide space to house the transponder 302 once the metal plate 306 is coupled to a container thus the recess or indentation 304 is preferably slightly bigger than the transponder 302 so as to house the transponder 302 while still fixing its orientation fig3 c is a top view diagram 370 for a metal plate 306 that has been coupled to a valve flange 108 for example by welding the metal plate 306 to the valve flange 108 the transponder 302 not seen is positioned underneath the metal plate 306 within the recess or indentation 304 as described above the valve flange can include a primary valve opening 114 and a secondary relief valve port 112 if desired it is noted that techniques other than welding could also be used to fix the metal plate 306 to the valve flange 108 for example a glue or an epoxy material could be used to couple the metal plate 306 to the valve flange 108 fig4 provides a diagram 400 for the fixed orientation.