this invention relates to pressure regulators used in scuba diving wherein a pressure sensing means is employed to actuate an associated valve member for controlling pressure in the regulator . specifically , the instant invention relates to that portion of the regulator housing including biasing means operably connected to said pressure sensing means wherein a pressure relief opening is provided in the regulator housing so as to expose the biasing means to ambient pressure conditions . the instant invention teaches the provision of a pressure bleed means for transmitting pressurized air through the regulator housing portion including the biasing means and outwardly through said relief opening . by this arrangement ambient water may not pass into the regulator housing through said relief opening which could otherwise result in potentially adverse effects on the operation of the biasing means .