Acker-Stone 2-141-06-06-281-00-00000 3 Piece Aviano Grande Paver Gila River - Acker-Stone has incorporated a sealant technology that is unmatched by any other sealant available. Unlike the conventional processes of subsequent sealing or impregnation, the Acker-Lock system is part of the production process and as a result integrated into the concrete stone. Colors and surfaces are permanently refined and protected, creating the only treatment that truly provides 360° protection.