stamp fig2 b shows a metal to metal seal ring interface between the reversible rupture disk assembly and a receiving wall the reversible rupture disk assembly is shown installed in a receiving wall 10 of a pressure containing system the threaded nut 1 engages corresponding threads 14 in the receiving wall 10 and the housing 3 is seated in the receiving wall 10 a metal seal ring 11 is shown in sealing engagement between the rupture disk assembly and the receiving wall 10 specifically the metal seal ring 11 is compressed sufficiently between a wall seal surface 12 of the receiving wall 10 and an abutment seal surface 13 of the abutment 2 of the housing 3 to seal pressure within the pressure containing system the metal seal ring 11 may be of generally circular elliptical diamond or any other suitable and known cross sectional shape required to achieve an interface pressure between the seal ring 11 and the seal surfaces 12 and 13 which is in excess of the pressure containing requirements of the pressure containing system as shown in fig9 burst disk 504 is mounted within pump outlet tube 500 the burst disk 504 is supported by backing plate 505.