CMP 25506-324-000 32" Black VGB Unblockable Channel Main Drain and Sump. Ensure safety in your pool with CMP Unblockable Drains that set a high standard for drain and suction safety. With the convenience of a single drain installation, pool owners can rest easy knowing that the drain cannot be blocked, thus eliminating any suction hazard. These drains come in flush, slim designs and multiple colors that blend seamlessly into your pool surroundings. Additionally, they feature a high-flow design that ensures better water quality and optimal system performance.