Caps are essential components used to securely seal the ends of pipes and fittings within industrial fluid transfer systems. They play a crucial role in preventing leaks, protecting internal components from debris, and isolating sections of a pipeline. Commonly found in plumbing or hydraulic applications, caps ensure system integrity during operation, maintenance, or when a line needs to be permanently or temporarily terminated. Their usage helps to maintain cleanliness and prevent accidental spillage or contamination.