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18 Products found

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  • Sealed Power Expansion Plug - 381-2074
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 55.575
    • Freeze Plug Diameter (Inches): 2.188
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 2-3/16" - ShallowCup - Steel
    • UPC: 614046200876
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-2098
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 13.716
    • Freeze Plug Diameter (Inches): 0.540
    • Package Alert: Single plug
    • Part Material: 17/32" - ShallowCup - Steel
    • UPC: 614046200920
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-2126
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 41.275
    • Freeze Plug Diameter (Inches): 1.625
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 1-5/8" - ShallowCup - Steel
    • UPC: 614046200944
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-2153
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 18.000
    • Freeze Plug Diameter (Inches): 0.709
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 18mm - MetricCup - Steel
    • UPC: 614046200999
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-2155
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 47.000
    • Freeze Plug Diameter (Inches): 1.850
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 47mm - MetricCup - Steel
    • UPC: 614046201019
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-2158
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 25.000
    • Freeze Plug Diameter (Inches): 0.984
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 25mm - MetricCup - Steel
    • UPC: 614046201040
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-2172
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 48.819
    • Freeze Plug Diameter (Inches): 1.922
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 1-59/64" - ShallowCup - Steel
    • UPC: 614046201163
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-2180
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 20.000
    • Freeze Plug Diameter (Inches): 0.787
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 20mm - MetricCup - Steel
    • UPC: 614046201187
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-2196
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 49.606
    • Freeze Plug Diameter (Inches): 1.953
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 1-61/64" - ShallowCup - Steel
    • UPC: 614046201309
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-3077
    Product Specifications
    • Design: Deep
    • Freeze Plug Diameter: 23.012
    • Freeze Plug Diameter (Inches): 0.906
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 29/32" - Cup - Steel
    • UPC: 614046201491
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-3167
    Product Specifications
    • Design: Deep
    • Freeze Plug Diameter: 48.412
    • Freeze Plug Diameter (Inches): 1.906
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 1-29/32" - ShallowCup - Steel
    • UPC: 614046201750
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-7158
    Product Specifications
    • Design: Shallow
    • Freeze Plug Diameter: 25.000
    • Freeze Plug Diameter (Inches): 0.984
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 25mm - MetricCup - Brass
    • UPC: 614046202283
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Engine Expansion Plug Kit - 381-8050
    Product Specifications
    • Package Alert: Full set
    • Part Material: Brass
    • UPC: 053059742124
    • Part Description: Engine Expansion Plug Kit
    More Info
  • Sealed Power Expansion Plug - 381-8085
    Product Specifications
    • Package Alert: Full set
    • Part Material: Brass
    • UPC: 614046144989
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Expansion Plug - 381-8088
    Product Specifications
    • Package Alert: Full set
    • Part Material: Stainless steel
    • UPC: 614046145627
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Engine Expansion Plug Kit - 381-8204
    Product Specifications
    • Package Alert: Full set
    • Part Material: Brass
    • UPC: 614046977174
    • Part Description: Engine Expansion Plug Kit
    More Info
  • Sealed Power Expansion Plug - 381-9012
    Product Specifications
    • Design: Deep
    • Freeze Plug Diameter: 30.000
    • Freeze Plug Diameter (Inches): 1.181
    • Package Alert: Single plug
    • Package Quantity: 1
    • Part Material: 30mm - MetricCup - Brass
    • UPC: 614046202436
    • Part Description: Expansion Plug
    More Info
  • Sealed Power Engine Expansion Plug Kit - 381-9667
    Product Specifications
    • Package Alert: Full set
    • Part Material: Steel
    • UPC: 614046872646
    • Part Description: Engine Expansion Plug Kit
    More Info

About Engine Expansion Plug

The engine expansion plug is also known as core plugs, or freeze plugs and they are utilized to fill the sand casting holes located in water-cooled internal combustion engines.

Engine expansion plug purpose

The engine expansion plug or core plugs are usually composed of thin metal cups that are inserted tightly into the casting holes, but they can also be made up of different materials like rubber. In many high-performance engines, the freeze plugs are big-diameter metal threaded pipe plugs. There is also a welch plug, which is made from thin metal and is dome-shaped as well as placed into the casting hole.

Common issues with a faulty engine expansion plug

A faulty engine expansion plug can lead to leaking, an overheating engine, or damage to the engine.