The Test Cock Plug 4 Pack is a reliable and essential part for maintaining the performance of backflow prevention assemblies. Constructed from durable plastic, these plugs are built to seal 1/4” test cock ports securely, keeping out dirt, moisture, and debris. Ideal for use in irrigation, plumbing, or water control systems, they help preserve system integrity and ensure a simple yet effective solution for quick repairs and routine maintenance on compatible backflow devices.