Astralpool Circular main drain Ø 270 mm. Made totally in white ABS, 1½'' bottom connection and 2'' side connections which can be plugged from the inside for pressure testing. 11/2” bottom connection with plug or for fitting the hydrostatic relief valve (00277) & drainage tube (21581). Grille cover diameter Ø 250 mm. Maximum flow rate: 13 m3/h.