Heat-Shrinkable Cable Splicing Matrix, Inline Polyolefin Protective Enclosure Sheath, 1kV Primary Insulation System Threshold, Moisture-Resistant Resin Core Seal, -50°C to +110°C Heavy Industrial Operational Window | High-performance heavy-duty electrical wire splicing kit manufactured by 3M Company featuring an advanced adhesive-lined wrap-around insulation shield and chemical-resistant protective backing, explicitly engineered to isolate environmental contamination, completely block water or chemical ingress pathways, and deliver stable physical line protection across buried distribution cables, pump networks, and harsh industrial wiring runs | Industry Exact Equivalents: 3M 80-6104-1351-2, 3M 80610413512, 3M PST-4 Series Splice Kit | Industry Functional Cross-References: Raychem WCF-250-BK, Thomas & Betts HS-KIT-2, Panduit HST-KIT-A | Military Specification National Stock Number (NSN): 5975-01-204-1351 [1]