Tier 15 and 22 Advanced Composite Material tapered rectangular handhole enclosures. Charles Industries TRUE grade level enclosures are made from Advanced Composite Material using a Resin Transfer Molding (RTM) process. TRUE exceeds industry tier loading standards while offering greater usable interior volume than comparable polymer concrete designs, with lighter weight and stackability for lower freight and handling costs. Units are available in Graystone and Utility Green, and offered in TRUE 15 (Tier 15) and TRUE 22 (Tier 22) load ratings. Integrated EMS detection, nameplate options, and stainless steel bolt hardware options are available. (Manufacturer product page and datasheet used.)