... from an injection molding curing, no weld; 2. High-quality raw materials, its elements are close, homogeneous, in addition, raw materials to add ... can withstand higher pressure6. The service life is up to 10 to 15 years. 2: cost savings 1. Modern management ... , never falling; 5. Garbage bins’ cover can prevent dissemination of smell, but also to prevent breeding of mosquitoes, flies breeding, health;