In plumbing and fluid dynamics, the opposite of a reducer is an increaser or amplifier fitting, which transitions a piping run from a smaller diameter to a larger diameter. While a reducer constricts the flow path to accommodate narrower branch lines or equipment, an increaser expands the flow pathway to handle greater volume, reduce flow velocity, or link smaller fixtures into expansive main drainage stacks or water supply headers, ensuring balanced hydraulic performance throughout the entire building infrastructure.
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