and drilled with different sized orifice holes to accommodate the amount of air to be removed and or recessed orifices inserted along its length these ends can be shaped say at an angle as shown at 52 to inhibit the ingress of falling condensate the end of each tube at inlet tube sheet 9 is attached in a sealed manner appropriate to condenser tube installation which includes expanding the tube into the tube sheet the outlet tube sheet openings may have no tubes and are plugged with suitable devices designed for this purpose a coupler to a large venting pipe consisting of tube insertable protrusions may be attached to each venting tube as shown at 53 a suitable vent pipe in the approximate size range of say 2 u2033 to 4 u2033 54 is weld attached or flanged to coupler 53 and coupled through the water box housing to an external vacuum system to vent the condenser section because condensate can enter the pipe or be formed on the internal walls of the pipe a drain is provided at the lowest portion of the vent pipe and fed through the tube sheet by removing a bundle tube and then fitted.