Abstract: An inflator for a vehicular air bag. The inflator has a metal cover and metal base sealingly connected to each other by a weldless joint. The cover or the base has a circumferential lip defining a channel and a rim of the other of the cover and base is received within the channel. The cover and base are shaped such that an external portion of the lip abuts the other of the cover and base to form a joint which sealingly connects the cover and base. In a disclosed embodiment, the cover and base are of stamped metal and the base has a circumferential lip defining a channel or trough which receives an external circumferential lip portion of the lid, an external portion of the lip being in abutment with the cover, the channel and lip portions thus being shaped to interlock with each other.