A device installed in the vapor return piping of a Stage II vapor recovery system that is designed to permit the collection and removal of any liquid that may accumulate in the line from vapors that condense. The device is especially useful in installations where the tanks are too shallow to allow for proper slope of the vapor return line.
The collection device, typically, is a short length of vertical pipe positioned beneath the vapor return line. If liquid forms in the vapor line, it will drop out into the container located at the liquid collection point. This liquid can then be pumped out and returned to the storage tank.
For details on liquid collection points, see PEI's Recommended Practices for Installation and Testing of Vapor Recovery Systems at Vehicle Fueling Sites, PEI/RP300.