- Home
- Stormwater Attenuation Accessories

Stormwater Attenuation Accessories
These stormwater attenuation accessories allow further functionality to SuDS systems.
In this section you will find:
- Upstream screening and debris chambers
- attenuation flow control and backflow prevention devices
Outlet Flap Valve, Anti Flood Non-Return Valve

Outlet Flap Valve, Anti Flood Non-Return Valve
£69.00
Please note there are two versions of this valve, this is the outlet flap valve suitable for placing onto the end of plain ended pipe. The Inline flap valve version can be found here. Non Return Valves for drainage and water pipes, available in two sizes 110mm and 160mm. Slips onto the end of pipes. Effective Anti-flood Valve and Rat Barrier D...

SuDS Rainwater Attenuation Sizing Design Calculation
£120.00
If you or your client are at the pre planning stage, have a planning condition or need to satisfy building control you may require an Attenuation tank or Soakaway sizing design to demonstrate the attenuation volume required. The output is a pdf document which provides the attenuation volume required. What we require: Address and Postcode o...

Silt Guard 300 Series Silt Trap for 110mm Pipework with Filter Bucket and Access Cover
£289.00
For the catchment and removal of silt and debris from roofs and hard standing areas, before entering the surface water drainage system. The Silt Guard SS300110 model is ideal for installation upstream of smaller volume, cellular/crate – attenuation systems, significantly improving the water quality going into the system, and thus supporting the ...

In line Back Flow Prevention Non Return Valve 110mm, 160mm, 200mm
£69.00
Please note there are two versions of this valve, this is the outlet flap valve suitable for placing onto the end of plain ended pipe. The Inline flap valve version can be found here. Inline Enclosed Back Flow Prevention Non Return Valve Backflow Prevention Valves (non-return valves) effectively secure any rooms located on the lower floors ag...

FlowBrake SuDS Attenuation Tank Orifice Plate
£29.00
As the name suggests the FlowBrake Orifice allows a simple orifice control and is suitable in situations where a varying a peak discharge condition is permitted. The orifice plate is fabricated from PVC and the orifice designed and fabricated in accordance with BS1042 and can simply be placed within any standard 110mm/160mm socket, 110mm/160mm t...
Soakaway test (BRE 365) Greater Manchester

Soakaway test (BRE 365) Greater Manchester
£300.00
In order to design a soakaway the ground conditions must be known. Specifically, the infiltration rate must be determined using the method defined in the Soakaway test (BRE 365). This measure is used to determine the volume and plan area of the soakaway. The Infiltration Test will be performed by a Chartered Civil Engineer. This service is ava...
300mm Chamber Extension Riser

300mm Chamber Extension Riser
£20.00
This silt trap extension riser is designed to be used with our SS300 amd SS500 series of silt traps and also OFCP300/1 series of our Orifo. It will increase the height of the silt trap chamber or Oriflo by ~ 135mm and a lid can be placed on top. Includes the rubber seal. Please note - This is not suitable for the SS300HD version

Soakaway Sizing Design Calculation BRE 365
£120.00
If you or your client are at the pre planning stage, have a planning condition or need to satisfy building control you may require a Soakaway sizing design to demonstrate the soakaway volume required. The output is a pdf document which provides the soakaway dimensions required. The calculation will be performed as per CIRIA 3D method as stand...
GRAF shaft chamber extension piece

GRAF shaft chamber extension piece
£269.00
GRAF chamber extension piece, 600mm diameter available in: 300mm Height (achieves ~ 265mm lift. 1210mm Height 1210mm Height with 200mm pipe fitting high level overflow stub. These riser sections are suitable for: Platin, Carat and Sustainable Urban Drainage systems. Heights given are nominal reference heights and will not provide the co...
Stainless Steel Vortex Flow Control Device

Stainless Steel Vortex Flow Control Device
£919.00
*Please note these are built to order - lead time 15-20 working days* *Curved mounting price assumes 1200mm chamber or smaller. For larger chambers, flows or head please get in touch* Vortex Flow Control devices are devices used downstream of attenuation systems. They operate by generating a vortex flow path within the device which in turn impe...
GRAF telescopic shaft cover access lid

GRAF telescopic shaft cover access lid
£219.00
GRAF Cast Iron Telescopic Dome Shaft. Suitable for use with the GRAF Carat S and Platin tanks. The 600mm diameter pedestrian lid is available in both mini and maxi options which is a reference to the rise available. Dimensions are nominal reference and will not provide the corresponding rise due to the overlap required. Please email technical ...

FlowBrake SuDS Attenuation Tank Floating Outflow Regulator with strainer
£59.00
FlowBrakeTM fixed head orifice SuDS flow regulator with strainer. If you require a SuDS flow regulator with an open orifice please see this product. This product is suitable were there is no or low upstream filtration. Turn any tank into an attenuation tank using this smart device. The floating intake ensures there is a fixed level of water...
Accesso Chamber Access Covers

Accesso Chamber Access Covers
£89.00
Accesso Inspection Chamber Access Covers available with the following options: Size (mm) Shape (Circular/square) Loading Capacity (Tonnes) 300ACST Access Cover 330x330mm Square Cover A15 Loading Access Cover – 300mm Square, A15 LoadingAccess Cover – 300mm Square, A15 Loading (SS300110)Access Cover – 300mm Square, A15 Loading (AICCP3...
Oriflo Flow Control 300mm ø Chamber P Series

Oriflo Flow Control 300mm ø Chamber P Series
£359.00
The P models are classed as unprotected orifice chambers and are specifically designed for installation downstream of pre filtered surface water run offs ie. permeable paving and cellular/crate attenuation systems. Designed to support SuDS management and the sewer infrastructure as part of a designed attenuation system, helping prevent flooding ...
40mm internal overflow tank connection kit

40mm internal overflow tank connection kit
£9.99
A neat way to an install an overflow is to incorporate the overflow internal to the water butt. This kit allows a tank connector to be fitted inside a water butt allowing the excess water to flow Kit 1 : Tank Connector +gasket Y branch Blanking plug Requires vertical piece of 40mm push fit pipe to suit water butt Kit 2 : As Kit 1 with the add...
Vortiflo Vortex Flow Control Chamber

Vortiflo Vortex Flow Control Chamber
£2,239.00
*POA, head and flow required to price correctly* **Please not these are built to order - lead time 10-15 working days** ***The Vortiflo range is not supplied with a cover*** Vortiflo Vortex Flow Control Chambers are specifically designed for controlling the flow of storm water from large volume attenuation systems, preventing downstream flooding...