Flexible Modern Siphon Roof Drainage Outlet for Large Span Steel Roofs and Siphonic Roof Drain Systems

• High drainage efficiency
• Fewer drainage pipes
• Save space

The Vantra Aluminium Funnel Baffle Siphon Drain is produced by Guangdong Wanquan, specially built as a durable stainless steel roof outlet for commercial steel building roof drainage. Engineered to withstand years of harsh outdoor exposure, this siphonic rainwater outlet is a long-life drainage solution for shopping malls, exhibition centers and large commercial steel roof projects.

Durability starts with premium raw material selection. The outlet flange and structural frame are constructed from high-grade stainless steel, which delivers exceptional rust resistance and oxidation resistance. It stands up to frequent rain, humidity and coastal salt spray without corrosion. The aluminium funnel baffle undergoes surface treatment to boost its anti-UV performance. It will not deform, become brittle or fade after long-time exposure to strong sunlight and extreme temperature swings, maintaining its original structural shape and filtering function year after year. The main connecting body adopts high-toughness HDPE, resistant to ageing and cracking.

All sealing components use high-elasticity ageing-resistant rubber gaskets. They keep stable sealing performance through countless freeze-thaw cycles and temperature changes, avoiding the common leakage problem caused by gasket ageing. Every product is subjected to accelerated ageing tests, salt spray tests and pressure durability tests before leaving our factory. We strictly reject unqualified parts to ensure stable performance over decades of service.

Its solid integrated structure also improves long-term reliability. The anti-vortex aluminium baffle is firmly fixed, resistant to impact from floating debris and rainwater impact. It keeps its anti-clog and air-blocking function consistently, so the siphon system works reliably season after season. Unlike ordinary drains that need frequent replacement, this heavy-duty design greatly reduces replacement frequency and cuts the overall lifecycle cost of commercial building drainage systems.

It is easy to install on steel roof panels and perfectly cooperates with roof waterproof layers. Compatible with standard HDPE siphon piping, multiple sizes are available for different project demands.

As an experienced manufacturer in Guangdong, Guangdong Wanquan focuses on long-lasting siphonic drainage products. We offer technical support and after-sales service for global contractors. Choose our Vantra siphon drain for low-maintenance, long-service-life roof drainage for your commercial steel buildings.

We accept OEM & ODM orders. As per the customer's drawing, OEM service is available. We can also put your logo on our products. 100% test before shipments.

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

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 is what you need. Sample lead time is usually 2–4 days, and 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 to you within 12 hours.

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