An interface for connecting a first vacuum source to a first vacuum apparatus, and for selectively connecting the first vacuum source and the first vacuum apparatus to a second vacuum apparatus without venting the first vacuum apparatus. A third fitting is connected to the first vacuum source, and makes a hermetic seal between the first vacuum source and the interface. A vacuum source line, having a first end and a second end, is connected by its first end to the third fitting. The vacuum source line receives a vacuum from the first vacuum source, and conducts the vacuum through the vacuum source line. A first tee section, having a first end and a second end, is connected by its first end to the second end of the vacuum source line. The first tee section receives the vacuum from the vacuum source line and conducts the vacuum through the first tee section. A first fitting is connected to the second end of the first tee section, and connects the first tee section to the first vacuum apparatus by making a hermetic seal between the interface and the first vacuum apparatus. The first fitting conducts the vacuum to the first vacuum apparatus. A second tee section, having a first end, a second end, and a second volume, is connected by its first end to the second end of the vacuum source line. The second tee section receives the vacuum from the vacuum source line and the first tee section and conducts the vacuum through the second tee section. The second volume of the second tee section is no greater than about two percent of the first volume of the first vacuum apparatus. A valve, having a first end and a second end, it connected by its first end to the second end of the second tee section. The valve selectively makes a hermetic seal at the second end of the second tee section, and alternately conducts at least a portion of the vacuum conducted through the second tee section. A second fitting is connected to the second end of the valve, and selectively connects the valve to the second vacuum apparatus, and makes a hermetic seal between the interface and the second vacuum apparatus.