The CXJ-200/CXJ-400 expansion joint system consists of an extruded, thermoplastic, dual gland expansion joint seals with integrated side flanges that are used to waterproof structural concrete expansion joints for positive-side below grade foundation walls and under structural slabs. The CXJ-200/ CXJ-400 expansion joint system can be integrated with Cetco's waterproofing systems to create a true single source waterproofing system. Movement at the joint is accommodated by the geometric shape of the double-cell, center gland configuration with two material layers to form the system. The center gland geometric shape is purpose-designed for low strain during movement, for optimal performance. The unique double flange design of the CXJ200/CXJ400 facilitates multi-layered, watertight integration with the waterproofing system. A termination bar and anchors are installed on both sides of the center gland to mechanically secure both inside flanges of the CXJ-200/CXJ-400 to the concrete.