Deck-O-Drain Drainage System - (Tops are NOT removable.) Use DECK-O-DRAIN to direct run-off water into lawn, garden or drainage area. Other One-Piece Pool Deck Drains (different measurements) The DECK-O-DRAIN Drainage System provides an effective drainage system for concrete pool decks. This One-Piece type drain Effectively collects water and carries it away quickly. Made of tough, long lasting PVC, the Deck-O-Drain System resists wear and is non-corrosive.