All plastic drains in the range are supplied with a UV-treated grating. · In accordance with Standard UNE 13451-1, for public swimming pools, the following are required: - Flow velocity of 0.5 m/s - Maximum suction velocity in the pipe of 1.5 m/s - Minimum distance between drains: >2 m · We recommend: Use of WARNER safety equipment for vacuum detection and automatic pump shut-off. Body and grille in white ABS. Grille secured with screws.