{"product_id":"southwire-mstr-300-b-liquid-tight-straight-connector-3-in","title":"Southwire MSTR-300-B Liquid-tight Straight Connector 3 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SOUTHWIRE MSTR-300-B is a 3-inch straight liquid-tight box connector designed for secure, watertight conduit terminations at electrical enclosures and junction boxes. Constructed from malleable iron with an insulated throat, this connector resists mechanical stress and protects conductors from abrasion at the entry point. It is used by licensed electricians wherever liquid-tight flexible metal conduit (LFMC) or liquid-tight flexible nonmetallic conduit (LFNC) must be terminated in wet, oily, or corrosive environments. The straight configuration suits direct entry applications where a 90-degree fitting is not required.\u003c\/p\u003e\n\u003cp\u003eThis connector is suited for industrial, commercial, and heavy-duty residential installations. Typical applications include machine tool wiring, HVAC equipment connections, pumps, compressors, and outdoor electrical enclosures where moisture ingress must be controlled. The 3-inch trade size accommodates large-diameter liquid-tight conduit runs commonly found in high-ampacity branch circuits and equipment feeder connections. This part is also referenced by Madison as MSTR-300-B and by Topaz as 478S.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eStraight configuration for direct conduit-to-box terminations without angular offset\u003c\/li\u003e\n  \u003cli\u003eMalleable iron body for durability and resistance to mechanical impact\u003c\/li\u003e\n  \u003cli\u003eInsulated throat protects wire insulation from abrasion at the connector entry\u003c\/li\u003e\n  \u003cli\u003eLiquid-tight design seals against moisture, oils, and contaminants\u003c\/li\u003e\n  \u003cli\u003e3-inch trade size for large-diameter conduit applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with 3-inch liquid-tight flexible metal conduit (LFMC) and liquid-tight flexible nonmetallic conduit (LFNC) in standard knockout termination applications. Cross-referenced with Madison MSTR-300-B and Topaz 478S.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize all circuits and lock out the panel before beginning work. The connector is tightened using an appropriately sized wrench on the locknut and connector body — do not overtighten malleable fittings. Verify that the conduit sealing ring is properly seated to maintain the liquid-tight integrity of the connection.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrade Size\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration\u003c\/strong\u003e: Straight\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Material\u003c\/strong\u003e: Malleable iron\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThroat\u003c\/strong\u003e: Insulated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConduit Type\u003c\/strong\u003e: Liquid-tight flexible metal or nonmetallic conduit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SOUTHWIRE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: MSTR-300-B\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SOUTHWIRE","offers":[{"title":"Default Title","offer_id":51383773954354,"sku":"MSTR-300-B","price":109.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/312671929.png?v=1782607044","url":"https:\/\/voomisupply.com\/products\/southwire-mstr-300-b-liquid-tight-straight-connector-3-in","provider":"Voomi Supply","version":"1.0","type":"link"}