The Fix-R EPDM Angled Roof Drain 90D 90mm x 90mm x 500mm can be used both as an external or internal drain and especially for horizontal drains through thick outer walls. The unit is used in conjunction with bends or fittings having seal rings and thus the joint can be within the wall and the down pipe can be placed at a minimum distance from the wall. We offer discounts for larger quantities so please feel free to contact us for more information. Leaf grate sold separately.