Waterstop-RX 101T is produced in a trapezoidal shape measuring 1-1/4" (31 x 12 mm) with a reinforcing plastic scrim embedded in the top surface for high tensile strength. The patented trapezoidal shape distributes the expansive force over a greater area and allows the concrete to flow more readily over the product during placement. RX-101T is designed for concrete 8" (200 mm) thick or greater with two rows of reinforcing steel.