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Home – Steel Pipe Fittings – Concentric Reducer – b169 dimension weight finder ASME B16.9 Concentric Reducer Dimension & Weight Finder Pick the large and small ends. End-to-end length H is set by the large end only, not the reduction ratio. Large end (NPS) Small end (NPS) Find dimensions & weight Large-end OD (D) Small-end OD (D1) End-to-end length (H) Weight, STD wall (nominal) Request this size with an EN 10204 3.1 MTC → Dimensions per ASME B16.9. STD weights are nominal references; exact weight by heat and schedule is stated on the Material Test Certificate. Wall thickness is customer-specified per the line schedule.