Dolphin Collection 3050803 3.5 GPF Single-Flush Manual Exposed Flushometer in Polished Chrome. Exposed Water Closet Flushometer. for floor mounted 1 exposed back spud bowls. Specifically engineered for salt water and severe water conditions.- Dolphin Collection 3050803 3.5 GPF Single-Flush Manual Exposed Flushometer in Polished Chrome.