Modifiers matching conduit:

• thermal,
• closed,
• ferrous,
• fluid,
• protective,
• hollow,
• supporting,
• clean,
• artificial,
• distinct,
• secure,
• liquid,
• individual,
• biological,
• geometrical,
• industrial,
• oriented,
• physical,
• concrete,
• inside,
• tubelike,
• elastic,
• ferromagnetic,
• circular,
• necessary,
• tubular,
• metallic,
• long,
• light,
• cold,
• continuous,
• metal,
• open,
• flexible,
• reusable,
• thin,
• conductive,
• underground,

Simple categories matching ferromagnetic:

• frame,
• alloy,
• metal,
• material,
• component,
• medium,
• pipe,
• part,
• object,
• substance,
• surface,
• system,
• article,
• layer,
• powder,
• particle,
• mineral,
• catalyst,
• cylinder,
• property,
• contaminant,
• structure,
• element,
• conduit,