A _____ is installed if vapor recovery piping lacks insufficient slope back to the UST.

A liquid collection point is necessary when vapor recovery piping does not have the proper slope directed back to the underground storage tank (UST). The purpose of the liquid collection point is to gather any liquids that may condense within the vapor recovery piping. If the piping does not slope correctly, any condensation from vapors can pool, potentially leading to operational issues or compliance violations.

By installing a liquid collection point, operators can ensure that these liquids are safely directed back to the UST, thus maintaining the integrity of the vapor recovery system and helping to prevent leaks or other malfunctions. This installation is crucial for systems that handle vapor recycling in fuel storage and distribution, promoting both safety and efficiency in the management of vapors.

Other options, like a vapor release valve, would not address the problem of liquid accumulation, while a condensation drain could imply a different method of liquid management, and an inspection hatch serves a distinct purpose related to accessibility and inspection rather than addressing the slope issue directly.