Roca The Gap Round WC Freestanding Compact Close Coupled Back to Wall Rimless Toilet Pan 600mm White A3420N7000. Roca The Gap is designed by Antonio Bullo has subtle design details that complement the smooth clean lines of each piece. The Gap collection provides a wide range of modern design options, including WCs, basins and bathroom vanity units to optimise any space. The extensive furniture range also includes perfect solutions for compact bathrooms as well base units for on countertop basins.