There is a problem in your version of the help file. From the documentation of v.5.31:
Effective Gasket Modulus
Typical values are between 300,000 and 400,000 psi for spiral wound gaskets. The higher the modulus the greater the tendency for the program to predict leakage. Errors on the high side when estimating this value will lead to a more conservative design.
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Regards,
Richard Ay - Consultant