1. The float is with a lever structure. The low position enables a more stable drain. 2. The bowl made of high-intensity PC and covered by steel case is safer to use. 3. Double strainer guarantees the operation of the drainer. 4. Inlet with large port size prevents the accumulation of particles or rust. 5. The drainage bowl with large capacity can keep more rust and dirt than general drains. 6. The drain is equipped with large float and sensitive to control. 7. The large bowl size can store a certain amount of water which reduces discharging time and extends the service life.