The 4" 150 316 Hexagonal Plug – SP114 is a durable 316 stainless steel fitting designed to securely seal the end of a 4-inch pipe. Its hexagonal head allows easy installation and removal with standard wrenches, while NPT threads (ASME B1.20.1) ensure a tight, leak-proof connection. Rated Class 150 and made to MSS standards, it is ideal for low to medium pressure applications in industrial, plumbing, marine, and chemical systems. Use it for temporary or permanent port closure to prevent leakage and contamination. Order now for fast shipping and reliable performance.