Waterproof Siphonic Roof Drain with PE Stainless Steel Baffle for Industrial Steel Roof Siphon Rainwater Outlet Systems

Vantra anti-vortex siphonic roof rainwater drain outlets, manufactured by Guangdong Wanquan, are premium siphon drainage components tailored for large steel workshop and industrial steel-structure roof drainage systems. Designed to deliver reliable high-capacity roof drainage during intense downpours, these rainwater outlets are widely adopted in industrial warehouses, exhibition halls, and commercial buildings with large-span metal roofs.

• High drainage efficiency
• Fewer drainage pipes required
• Saves installation space

Crafted with strict quality standards, this siphonic drain combines high-performance modified HDPE and polished stainless steel for its baffles, flange, and sealing assembly. The injection-molded PE main body boasts great toughness, ageing resistance, and UV stability, making it suitable for long-term outdoor exposure. Stainless steel accessories are anti-corrosion and rust-proof, capable of withstanding harsh weather conditions. Every unit undergoes rigorous factory inspections, including watertightness pressure testing, flow simulation, and dimensional verification, to rule out leakage risks and ensure consistent quality for global construction projects.

Its core anti-vortex structure is professionally optimized. The built-in baffle suppresses air intake and stops vortex generation, sustaining stable siphon action. Unlike traditional roof drains, it can maintain a high continuous drainage rate while blocking leaves and large debris to lower pipeline clogging chances. It forms a perfect match with standard HDPE siphon drainage pipes, creating an efficient fully-pressurized siphon drainage system for flat roofs.

As a trusted Guangdong-based manufacturer, Guangdong Wanquan specializes in siphonic roof drainage solutions. We support OEM and ODM services, provide engineering drawings, technical consultation, and installation guidance for overseas contractors and distributors. All our products comply with international drainage industry standards. If you are seeking durable, high-efficiency siphonic rainwater outlets for your steel-structure roof project, Vantra drains from Guangdong Wanquan will be your ideal choice.

This drain outlet is specially optimized for steel structure metal roof panels. It works harmoniously with roof waterproof layers. The integrated sealing gasket and flange design greatly reduce the risk of joint water seepage. Bolted installation is straightforward, cutting on-site labour and construction time. Multiple standard DN sizes are available to satisfy different flow rate demands of various projects.

We accept OEM and ODM orders as per the customer's drawing; OEM service is available. We can also put your logo on our products. 100% testing is performed before shipment.

Die casting offers tolerances ranging from +/-0.003″ to 0.005″ per inch, and even as tight as +/-0.001″ depending on customer specifications.

Die cast parts can be produced with smooth or textured surfaces and a variety of paints and plating finishes. Finishes can be chosen to protect from corrosion and improve cosmetic appearance.

We usually charge a relevant sample fee. The sample fee is refundable when the order reaches a certain quantity. Make sure our product meets your needs. Sample lead time is usually 2–4 days; 10–12 days for batch goods.

We provide twenty-four-hour service that allows you to send information at any time of the day or night. We will reply within 12 hours.

We have our own various patents and hydraulic calculation book. We have a design team to make customized products; we can also design products as per your description.