Reducer

Reducer is a general identity for a fitting that connects different sizes, but it does not by itself establish the exact connection geometry. Without confirmation of the product form, it cannot safely be described as a reducing coupling, male-to-female adapter, reducing nipple, or bushing because those forms use different end arrangements and assembly principles. Selection must explicitly define body form, both end sizes and types, reduction direction and ratio, sealing method, engagement, tool clearance, and flow-path limitations. Material, coating, thread form, and operating conditions must also be established separately from actual product and project documentation.