1.Non-toxic health 2.Easy installation 3.Superior physical properties 4.Cheap price 5. At least 50 years of life Specifications: 20x1/2" 25x3/4" 32x1" 40x5/4" 50x3/2" 63x2"Feature:1. Save raw material, low lossaaaa2. the operation is simple, fast installation, economic, disassemble, maintenance3. but pressure drainage, aging resistance, long life, general and simple, reliable, connected not ...