This is the solution to premature burst panel failure, and is NHRA approved. This kit allows you to run two burst panels 7/8" apart in the blower, which gives you redundancy. 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 kit comes with 2 rings, a spacer and 24 socket head cap screws.