The hard polyvinyl chloride (PVC-U) pipes and fittings for building drainage are made from polyvinyl chloride resin as the main material, with high-performance processing additives added. They are produced through high-speed extrusion or injection molding, representing a fully plastic product. Compared to traditional pipelines, they have advantages such as lightweight, corrosion resistance, low water flow resistance, energy saving, quick installation, and low cost. Shandong Luyu Plastic Industry Co., Ltd. produces "Luyu" brand PVC-U drainage pipes and fittings using high-quality domestic and international raw materials, scientifically proportioned, and equipped with advanced production equipment for extrusion. This ensures that the product performance fully complies with national standards and enterprise standards, reaching an advanced domestic level, and is widely used in various systems such as drainage inside and outside buildings or underground, industrial wastewater discharge, and ventilation ducts.