Abstract: An assembly comprising: an inflator (20) for providing inflation gas, including a cylindrical body (22, 44) having at least one exhaust port (42a,b) located on a wall thereof through which a stream of inflation gas (40) exits, and a retainer (140) for securing the inflation means, including a hollow cylindrical retainer body for receipt of the inflation means and for diverting the inflation gas stream into a diffuser. The diffuser (210) comprises an inflatable gas permeable portion (212) for receiving the inflation gas stream such that when the inflation gas exits the gas permeable portion such inflation gas is generally uniformly distributed therethrough and communicated to an air bag. The diffuser includes a first portion (216a,b) attached the gas permeable portion and secured to the retainer. The air bag (230) is secured about the diffuser, for receipt of the inflation gas exiting the diffuser.