there is disclosed a high pressure sensing header which is relatively insensitive to mounting torque . essentially the header consists of an outer torque isolating shell which has a “ c ” shaped cross section with the cylindrical shell surrounding an inner “ h ” section header . the inner “ h ” section header has a thick diaphragm and is surrounded by the torque isolating shell which is secured to the “ h ” section header at a peripheral flange of the “ h ” section header . in this manner when the header is installed , the installation force is absorbed by the outer shell and there is no installation force or torque exhibited by the inner “ h ” section which will respond only to stress due to pressure . the torque isolating shell also contains a top surface which has a counterbore which can accommodate a crush ring , and when the unit is installed , the crush ring is forced or crushed against an installation wall to enable the inner header to receive pressure without experiencing any significant installation force .