By utilizing a graphite rupture disk mounted between stainless steel inlet and outlet connection sealing on an O-ring, ZOOK can provide low burst ratings, operating ratios of 90%, and leak rates better than 1 X 10-5 std. cc/sec helium gas.* *Leak rate based on graphite disk and o-ring seal **Muffled outlets reduce noise levels and redirect fragment or product released when the rupture disk bursts