... weight,convient for construction,anti-aging. 2.good drainage Plastic blind drain --Specificationsgeocomposite drain type:square circular,sheet color:white,green,blue,black material ... ≥828285828282848585PressureResistanceFlat rate 5%608250708085804050Flat rate10%110120701101601701407070Flat rate15%15016012513020022018010090Flat rate20%190190160180250280220125120 plastic blind drain