Abstract: A push-on retainer (16, 116) is provided for securing together an initiator (14) and another element of a gas generating system. The retainer (16, 116) includes a first portion (16a, 116a) for engaging a surface of the other element of the system, and a second portion (16b, 116b) coupled to the first portion for engaging a surface of the initiator (14) to secure the initiator to the other element of the gas generating system. A vehicle occupant protection system (180) is also provided which includes a gas generating system utilizing a push-on retainer (16, 116) for securing the initiator (14) to the other element of the gas generating system.