This standard pertains to waveguide flanges for the situation where two waveguides are in close proximity@ such as short slot hybrids@ dual TR tubes@ etc.@ and provides a Dual Contact Pressurizeable Flange for use with two rectangular waveguides per EIA Standard RS-261@ Rectangular Waveguides (WR10 to WR2300)@ for the waveguide sizes WR90 through WR975@ for both the narrow wall and broad walls of the waveguides adjacent to each other. It also provides for a miniature version for the waveguide sizes from WR90 to WR284. Drawings plus tables showing the actual dimensions are given. By specifying assembly dimensions in lieu of detail part drawings@ it provides for interchangeability and permits manufacturing flexibility with regard to the method of joining the flanges to the waveguide. The dual flange bolt hole pattern is the same as two single EIA standard flanges put together except where interference occurs@ for both side wall and top wall configurations.