Penguin Technology has designed a toilet with a secondary drain system that allows the contents to drain out through a separate drain line in the event of a clog in the main trap. This system adds protection against overflows. If a blockage occurs and the toilet clogs up, water continues to rise until it reaches the primary overflow holes. At this point, the water drains through the secondary system bypassing the main trap and drains directly into the sanitary main. In the unlikely event that the primary overflow holes are obstructed, the water then continues to rise until it enters the holes under the rim where it travels through a hidden inlet into the secondary drain system and then drains into the sanitary main, once again protecting from an overflow. This amazing system offers 2 means of protection against overflow! - Most orders ship in 3 to 5 business days.