Compression Union

Browse our selection of steel high-pressure compression unions, available for 1/4", 5/16", 3/8", and 10mm tube sizes. These leak-resistant, precision-machined fittings are designed for secure connections in brake lines, fuel systems, and industrial fluid transfer. Ideal for high-vibration or high-pressure applications requiring reliable compression sealing.

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11 products

  • Brake Line Adapter Fitting Union Tube Nut Assortment Kit - 158 Pieces

    Brake Line Union & Tube Nut Assortment Kit - 158 Piece

    This 158-piece assortment kit includes a wide range of brake line union fittings, tube nuts, and fuel line...

    $155.99 USD
    $155.99 USD
  • 1/4" Inverted Tube Union 

    1/4" Inverted Tube Union 

    Brass Fitting size: 1/4" Inverted Tube Union�

    $1.12 USD
    $1.12 USD
  • Brake Line Union Invert Flare Tube Nut 1/4" to 3/16" -24 TPI - Each

    Brake Line Union Invert Flare Adapter - 1/4" to 3/16" Tube with 24 TPI

    This brake line union fitting is designed to reduce a 1/4" brake tube down to 3/16", making it...

    $13.99 USD
    $13.99 USD
  • High Pressure Steel Compression Union Tube Nut - 3/8" - Each

    High Pressure Steel Compression Union Tube Nut - 3/8" - Each

    Compatible with all metal tubes 5000 PSI Burst Pressure 1200 PSI Working Pressure Suitable for all vehicles including...

    $10.44 USD
    $10.44 USD
  • 1/4" 360 Degree Seal Compression Union - Each

    1/4" 360 Degree Seal Compression Union - Each

    360 Degree seal compression unions permit the use of one part number of each size to effectively and...

    $5.00 USD
    $5.00 USD
  • High Pressure Steel Compression Union Tube Nut - 5/16" - Each

    High Pressure Steel Compression Union Tube Nut - 5/16" - Each

    Compatible with all metal tubes 5000 PSI Burst Pressure 1200 PSI Working Pressure Suitable for all vehicles including...

    $10.44 USD
    $10.44 USD
  • High Pressure Steel Compression Union Tube Nut - 1/4" - Each

    High Pressure Steel Compression Union Tube Nut - 1/4" - Each

    Compatible with all metal tubes 5000 PSI Burst Pressure 1200 PSI Working Pressure Suitable for all vehicles including...

    $10.44 USD
    $10.44 USD
  • Brake Line Union Invert Flare Tube Nut 1/4" x 7/16" - 24 TPI - 10 Pack

    Brake Line Union - Inverted Flare Tube Nut - 1/4" Line - 7/16"-24 Thread - 10 Pack

    This brake line union inverted flare tube nut is designed for secure, high-pressure connections in automotive brake and...

    $16.07 USD
    $16.07 USD
  • 3/8" 360 Degree Seal Compression Union - Each

    3/8" 360 Degree Seal Compression Union - Each

    360 Degree seal compression unions permit the use of one part number of each size to effectively and...

    $6.32 USD
    $6.32 USD
  • 5/16" 360 Degree Seal Compression Union - Each

    5/16" 360 Degree Seal Compression Union - Each

    360 Degree seal compression unions permit the use of one part number of each size to effectively and...

    $5.67 USD
    $5.67 USD
  • 3/16" 360 Degree Seal Compression Union - Each

    3/16" 360 Degree Seal Compression Union - Each

    360 Degree seal compression unions permit the use of one part number of each size to effectively and...

    $6.53 USD
    $6.53 USD