What is necessary to provide at any point in the line of pipe where condensate could collect?

In a gas piping system, it is essential to address the issue of condensate collection, which can occur due to temperature changes or the presence of moisture in the gas. A drip is the correct choice because it refers specifically to a fitting or device designed to collect and allow for the drainage of this condensate from the line.

Installing a drip at points where condensate is likely to accumulate ensures that moisture does not build up within the piping system. This is crucial for maintaining the integrity and safety of the gas delivery system, as excess moisture can lead to corrosion, blockages, or other operational issues. Drips facilitate the removal of this unwanted liquid, helping maintain the overall functionality and safety of the gas piping system.

While vents, traps, and filters serve different purposes in various systems, they do not specifically address the need to collect and remove condensate in the same manner as a drip does.