an electrical feed through for powering an apparatus inside the vacuum system while still maintaining the u201c vacuum tight u201d integrity of the system similarly the inner web of the thin flange may be equipped with a valve therein providing direct communication with interior of the vacuum system without decreasing the conductance of the system which does result from typical valve mounting systems disposed on a couple or tube further the thin flange can mount an interior component such as an electron gun as well as provide an electrical feed through this is an improvement over having the electrical connections on a separate port of the vacuum chamber as is conventionally the case the advantage is that the connection does not need to be done at the location of the vacuum system since the component can be mounted within the thin flange and the electrical connections may be made as an independent subsystem should the component need to be removed from the vacuum system the connection would not need to be disassembled and subsequently reassembled when the component was remounted this configuration of components saves time and may reduce the number of ports required on a main chamber of a vacuum system further embodiments of the coupling flange obviously include different lengths different industry standard flange sizes different flange geometries such as oval rectangular or other planar shape and different interior mounting arrangements on slightly thicker versions of the flange radial ports may be added to increase access to internal components the thin flanges could also be stacked with the limit only being the twist up and stretch of the set of bolts in consideration of the various above described embodiments and applications consistent with the present invention it will be readily appreciated that the thin flanges consistent with.