Astralpool NORM main drain Flat grille without inserts. The new range of Main drains according to the normative EN-13451-1 and EN-13451-3, available for public and private pools, supplied with flat grilles or antivortex grille. Made in white ABS and UV treatment, 2″ side connections and bottom connection with plug for fitting the hydrostatic relief valve (00277) and drainage pipe (21581). Recommended max. flow rate: 15 m3/h Item available in White, Beige, Light Gray and Anthracite colors.