The 3/8″ 316 Stainless Steel Square Head Plug – SP114 is a precision-engineered industrial fitting designed for reliable performance in demanding piping systems. Made from premium 316 stainless steel, it offers exceptional corrosion resistance in marine, chemical, and high-moisture environments while securely closing unused connections to minimize contamination risks. Featuring ASME B1.20.1 NPT threads and a square head for easy installation and removal, it provides a leak-resistant fit ideal for trunk lines, header connections, and maintenance isolation points. Rated for MSS Class 150 applications and compliant with ASME B31 piping codes, the SP114 delivers long-lasting, professional-grade performance. Order now for fast shipping and dependable results.