With accurate temperature, time melting, rapid absorption of active ingredients and other additives, fine features. PVC-U Drainage Fittings:BS Standard,High Flow Capacity, Corrosion Resistant,Low Installation costs,Longevity,Environment-friendl Features:Descriptions: Coupling (HUB×HUB)Material: unplasticized poly (Vinyl chloride)Colors: white and other colors availabe upon requestStandard: BS ...