Part #: K4IU6A

4-Inch Thread On Ductile Iron Quick Connect Assembly, Black Viton A Gasket

Salco Products (K4IU6A) 4-Inch Thread On Ductile Iron Quick Connect Assembly, Black Viton A Gasket fits a 5-1/4-inch rail road thread. The quick connect adapter is 6-1/2-inches high, made out of ductile iron, and features a 4-inch cam groove. Includes a 3/8-inch, carbon steel, chain with 15 links; 3/8-inch by 3-1/2-inch zinc plated carbon steel S-hook, 3/8-inch -16 by 1-3/4-inch, zinc plated carbon steel, hex bolt; 3/8-inch -16, zinc plated carbon steel nut, and 3/8-inch, zinc plated carbon steel flat washer. Comes with a black Viton A gasket. The 4-inch, quick connect, cammed cap is made out of ductile iron with 304 stainless steel straight cam arms. Features a 1-inch NPT, carbon steel, plug assembly with 1/4-inch, carbon steel, swivel link and 15 chain links, approximate length of 19-inches. The cap includes two (2), zinc plated carbon steel, 3/8-inch by 3-1/2-inch S-hooks and 3/8-inch, 18-8 carbon steel chain with 15 links, approximate length of 21-inches. Cap comes with a black Viton A gasket. AAR Approval # E-232133. Not Approved for DOT Stenciled Cars.

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Key features

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Provides direct connection to kam and grooved hoses or adapters, no additional components required.

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3", 4" and 6" sizes.

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Reducing Flanges available.

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Designed to provide a secure fitting that will minimize leaks and spills.

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DOT (threaded) and AAR (kammed) approved designs.

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Assemblies include adapter, cap, plug, chain and gaskets.

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Available in Stainless Steel or Ductile Iron.

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Contact your Salco Representative for the specific adapter types and sizes that will fit your needs.

Specifications

Adapter Material
Ductile Iron
Cap Material
Ductile Iron
Gasket Material
Black Viton A
Location
Bottom
Size
4"

AAR Approval

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AAR Approval: E-232133

Resources

Product Card • December 17, 2025

Bottom Unloading Adapters