Abstract: An inflator (14) includes a structure (20) that helps define a chamber (30) for containing a volume of inflation fluid (32). A closure member (90) is openable to provide fluid communication between the chamber (30) and an exterior of the inflator (14). A stamped end cap (100) is connectable with the structure (20) to help close the chamber (30). The end cap (100) is made of a steel plate material and has a stamped initiator support portion (112). The initiator support portion (112) has a passage (116) that extends through the end cap (100). An initiator (114) is supported in the initiator support portion (112) of the end cap (100).