Pentair Main Drain 500110Pentair StarGuard Main Drain 500110 Pentair StarGuard drains comply with provisions of the ANSI APSP 16 2011 standard as required by the Virginia Graeme Baker Pool & Spa Safety Act. StarGuard drains have an industry leading 15. 35 square inches of open area for water flow. If you are in an area where water velocity through the grate is limited to 1. 5 feet second, the StarGuard covers allow flow rates up to 72 GPM. StarGuard Drain Features: StarGuard