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Thanks for looking at my Crown 49 VR4 Radial Vortex Control Hydro Brake - drainage flow control valve for a hydraulic chamber. This is new and unused but has been sat in my shed for a while. Ordered this but didn't actually need to install a storm chamber in the end. Unfortunately I left it too late to return. Cost over £600 new and can send more photos with dimensions if you wish. Crown's website - www.crownwater.com states: Self activating No moving parts to wear or replace No power supply required Robust stainless steel construction Developed specifically for use in drainage systems, our individually designed vortex flow controls offer an effective solution to your storm water management problems. Each unit is configured to suit the site and to fit easily into the drainage infrastructure. Our vortex flow controls are currently in use throughout the UK. Vortex flow controls do not rely on external power supplies or moving parts. An internal vortex, generated by the incoming water, controls the through flow. The unique flow characteristic of the flow control ensures optimum use of upstream storage while the large cross sectional areas greatly reduce the risk of blockage. Location Yarburgh Way, York, York, YO105HB what3words