Non-slump, ready-to-use, single component, neutral cure, elastomeric silicone firestop that also acts as a barrier to water leakage and airborne sound transmission. Typically used to firestop items that penetrate fire-rated wall or floor assemblies. 3M Fire Barrier Water Tight Sealant 1000 NS provides up to 3-hour fire protection. Light gray color, no mixing required.