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The HKS 4–6mm reducer fitting adapts between 4mm and 6mm connections and serves as a compact plumbing solution where a stepped tubing junction is needed. As a replacement‑parts fitting from HKS, it provides a straightforward way to join mismatched small‑diameter lines without altering system components, offering a simple service or repair option for compatible fluid or vacuum routing applications.
HKS 4-6mm Reducer Fitting
