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The initial 2-5mm rain is heavily polluted, and quite small flow. Because of gravity, the rain will first pass through the lower and open discharge pipe in this device. When the rain volume increases, it hits the top heavier, and the floating ball in the sewage pipe is under a certain pressure, to stuck the first flush pipe. Water level in the tank goes up, and the rainwater goes through a horizontal filter and the outlet, to be harvested into the storage tank. After the rain stops, with the reduction of the rainwater stored in the device, the floating ball is automatically reset because of its spring force, and the garbage produced by the filter is brought out, so as to achieve first flush, filtering, automatic discharge of sewage and so on.


It can be used as a first flush device in rainwater systems on roofs, under grounds or roads, and generally installed after interception basket device.








Height 555mm,
diameter 200mm

Height 1000mm,
diameter 600mm

Height 1000mm,
diameter 600mm

Inlet and Outlet




Sewage Discarding Pipe Size

DN 50



installation requirement

Roof of buildings less than 9 storeys (if more than 9, take energy-saving measure into consideration)

The drop between inlet pipe and  outlet pipe must be more than 30cm

The drop between inlet pipe and  outlet pipe must be more than 30cm

control method

Rainfall control

Rainfall control

Rainfall control

material quality


PE / FRP / stainless steel / 304

PE / FRP / stainless steel / 304


Posted by Zepo Yu
e-MailContact company
Shenzhen Doctor Rain Rainwater Recycling Co., Ltd.
Address Building F, Songgang Jialongda Science Park, Baoan Distric
City & ZIP
For registered Members only.
For registered Members only.
Key Customers / Clientele around the world
Company Profile Shenzhen Doctor Rain Rainwater Recycling Co., Ltd. is a production-oriented enterprise, which cooperates with many foreign companies,with its own brand Doctor Rain. With years of experiences, the enterprise insists on the road of independent innovation, focusing and specializing. At present, the company has formed a comprehensive rainwater utilization system including R&D, production, design, sales and construction.
Based on Doctor Rain\'s rainwater collection system, drainage system, infiltration system and seepage and drainage integration technology,with independent intellectual property rights, the company has achieved breakthrough research results in rainwater comprehensive utilization technology, and has fully realized the industrialization of scientific research results. We declared more than 30 patents for the related technologies. With years of technical accumulation and business innovation, we have passed certification for GB/T19001-2008/ISO9001: 2008 Standard Quality Management System, GB/T28001-2011/OHSAS 18001:2007 Occupational Health and Safety Management System,and GB/T24001-2004/ISO14001:2004 Environmental Management System.
URLFor registered Members only.
Rating (0 reviews)
Keywords (seperated by comma)Sewage Interception
Product SpecificationsHeight1000mm, Diameter600mm
Industry CategoryEnvironment Water treatment
Quality/Safety CertificationsGB T19001 2008 ISO9001 2008
Delivery Lead Time15
Payment & Price TermsFOB
My Offers1
Product Portfolio / Other Products
Customersaround the world
Detailed Company Introduction
FOB Price & PortFOBShenzhen
Packaging Detailspallet
Our Team100 500
Web SiteFor registered Members only.

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 Product Details
 Product id  618092
 Visits   173
 Date  2019.07.24

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