Steel Cup Expansion Plug 1 In., SC, Height 0.250
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Steel Cup Expansion Plug 1 In., SC, Height 0.250
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Dorman - Autograde Steel Cup Expansion Plug 1 In., SC, Height 0.250

Part No. 555-018 Warranty Details  

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Our Engine Expansion Plugs are available in multiple styles, including Cup Type, Pilot Seal, Reverse Taper, Concave, Quick-Seal® . Our unique Pilot Seal Expansion Plug ensures a leak-proof fit.

Product Features:
  • Many sizes available
  • Conveniently available in packs of different quantities
  • Constructed from high quality steel, copper, brass, or rubber
  • Dorman’s Engine Expansion Plugs are constructed to strict engineering quality standards
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1 Question | 1 Answer
Displaying question 1
  • Q:

    Is this the plug that is on passenger side of the Buick 3800 engine to the
    Right of alternator not the rubber one under alt. but just right of it looking
    At from under the hood facing back of car?
    Asked on 1/18/2014 by Imp69 from 1/2 block from Hirsch Advance Store,Chgo

    1 answer



      Hi Imp69, good question! The Buick 3800 engine contains two freeze plugs, one one either side. They are located between the core plugs on the engine block.

      Answered on 1/20/2014 by Vincent from AAP
Displaying question 1

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