One panel goes between the ring and spacer, while the other is flush against the rear cover. A test port in the spacer accepts an Enderle nozzle and hose which allows you to check the inner burst panel, in case it has failed. The rings are made from billet alum. and scalloped for weight reduction and O-ringed for a superior seal.
The kit comes with two burst panel rings, a spacer and 24 socket head cap screws, O-rings and two SFI burst panels.