Reducers were introduced in 2009 and follow the SAAFTA regulations for reducers. Commonly used fittings include for straight connectors, reducers, bends, and tees. Concentric reducers are useful when cavitation is present. Unlike eccentric reducers, concentric reducers have a common center line. Reducers in vertical lines are generally concentric unless the layout dictates otherwise. Shotgun conversion sleeves may be called subgauge inserts, subgauge tubes, or gauge reducers. Modern admixtures and water reducers can modify that time span to some degree. Gear reducers may be used to increase resolution of positioning. In the concrete technology, plasticizers and superplasticizers are also called high range water reducers. Fever reducers and lukewarm baths can help decrease body temperature. Reduction couple's body is supported on a wheel pair through a pair of friction reducers. Antipyretics (i.e., fever reducers) are commonly used. Most quantitative metabolites are digestibility reducers that make plant cell walls indigestible to animals. Water flow through a tap can be reduced by inexpensive small plastic flow reducers. It is used in water hardness reducers.