The 4 150 316 Square Head Plug - SP114 is a professional-grade stainless steel fitting engineered for demanding industrial applications. Made from premium 316 stainless steel, it offers superior corrosion resistance in harsh environments, including marine and chemical exposure, while reducing contamination risks by securely closing spare connections. Designed with ASME B1.20.1 NPT threads and a square head for easy installation and removal, it ensures 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 reliable, long-lasting performance in piping systems and fluid handling equipment. Order now for fast shipping and dependable, professional-grade results.