The Blue-White red plug is designed for compatible F-300, D-300, and U-300 applications where a port or opening needs to be sealed. A plug is useful because it helps close off an opening securely, supporting leak prevention and dependable operation of the connected assembly.This replacement is especially useful when the original plug is cracked, stripped, damaged, or missing. Including PTFE tape can help support cleaner installation and more dependable sealing during service.The F-3005 is a practical service part when a compatible Blue-White system needs a plug to restore dependable port closure. Blue-White red plug Fits compatible F-300, D-300, and U-300 applications Includes PTFE tape Useful when the original plug is damaged or missing Supports cleaner and more dependable sealing