pressurized gas from the chamber 60 and controls flow of the hydraulic fluid in and out of the accumulator through the connection 54 as described above in certain installations it may be desirable to have a specific pressure rating for the gas end 52 and or the connection 54 the dual pressure flange 50 may couple to the connection 54 of the accumulator 38 to provide the desired pressure rating and allow connection of the liquid line 58 for example as described further below the dual pressure flange 50 provides connection and sealing capability to enable use in a deep water subsea installation of the accumulator 38 such as for pressure ratings of at least about 10 000 psi further the dual pressure flange 50 provides connection and sealing capability to enable use in conventional subsea installations such as for pressure ratings of at least about 6 000 psi fig4 a and 4b depict a front perspective view and a rear perspective view respectively of the dual pressure flange 50 in accordance with an embodiment of the present invention as shown in fig4 a the dual pressure flange 50 includes eight fasteners such as attaching bolts 68 arranged in two rectangular four bolt patterns as described further below in some embodiments the fasteners may be threaded to enable coupling to the connection 54 of the accumulator 38 as shown in fig4 b the bolts 68 are removed from the flange 50 to illustrate a plurality of holes 69 e.