High Flow Siphonic Drain Funnel with PE/SS Baffle Siphon Drainage Outlet for Prefabricated Steel Structure Roof Rainwater Drain

The Vantra High Flow Siphonic Drain Funnel is a high-performance siphonic roof drainage outlet engineered specifically for prefabricated steel structure buildings. Manufactured by Guangdong Wanquan, it is equipped with a combined PE and stainless steel baffle, making it a core component for reliable roof rainwater removal. It is widely used in prefab workshops, modular warehouses, prefabricated exhibition centres and other large-span steel construction projects.

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

Guangdong Wanquan adheres to strict quality control standards throughout production. The main body is made of high-quality modified HDPE material through precision injection moulding, featuring outstanding toughness, ageing resistance and UV resistance to withstand long-term outdoor exposure and changing climates. The baffle and flange adopt premium stainless steel, delivering excellent rust and corrosion resistance. The matched rubber sealing gasket maintains stable sealing performance and effectively prevents roof water leakage.

Each finished product passes a watertight test, flow performance test and dimensional inspection before shipment, guaranteeing consistent and dependable quality for global engineering partners.

The pipes are made from 100% new material with excellent corrosion resistance, withstanding a variety of chemical and electrochemical corrosion. Under normal working conditions, they can be used for more than 50 years.

The unique PE and stainless steel baffle structure is designed for high-flow drainage. It restrains vortexes and prevents air from entering the pipeline, helping the system quickly form and maintain stable siphon pressure. Compared with conventional roof drains, the Vantra siphonic drain funnel achieves larger instantaneous drainage capacity under heavy rain, avoiding roof ponding risks. Meanwhile, the baffle intercepts large debris such as leaves and plastic scraps, greatly reducing the probability of pipeline blockage and lowering later maintenance costs.

This siphonic drainage outlet is well adapted to the features of prefabricated steel roofs and cooperates perfectly with roof waterproof layers. The bolted connection design is simple and fast, fitting the efficient construction rhythm of prefabricated buildings. It is compatible with standard HDPE siphon pipe systems and is available in multiple calibre options to meet different rainfall load and drainage design requirements.