A drain is a component used to remove unwanted liquids such as water, oil, or condensate from air, fluid, or process systems. It helps prevent moisture buildup, corrosion, contamination, and performance issues by safely discharging collected fluids from filters, tanks, pipes, and equipment.

Drains are widely used in compressed air systems, air dryers, filters, separators, HVAC units, and industrial machinery. They can be manual or automatic and play a critical role in maintaining system cleanliness, efficiency, and long-term reliability by keeping internal components dry and protected.