Single baffle and double baffle flow regulators throttle water flow without a vortex effect. They are an appropriate alternative for some projects, notably those involving particularly large water volumes usually with relatively low heads. These are typically used where a cyclone flow regulator would be too big for most inspection chambers, very expensive and completely incapable of attenuating flow using the vortex effect. A single baffle or double-baffle requires less space and is less costly, but its orifice opening is smaller.