Dorman Autograde Steel Cup Engine Expansion Plug 1-5/8 Inch with 0.500 Inch Height 555-030

Steel cup engine expansion plug 1-5/8 inch diameter with 0.500 inch height used to replace worn or leaking core plugs in automotive engines.

Built to meet the manufacturer's design intent for reliable service, this plug is constructed from quality steel materials to ensure a secure seal and long-lasting durability under engine operating conditions.

Key Features

• Constructed from durable steel for corrosion resistance
• Precise 1-5/8 inch outer diameter for accurate fitment
• 0.500 inch height matches original equipment specifications
• Designed as a direct replacement for failed factory plugs
• Validated through testing for consistent performance
• Backed by over a century of automotive industry experience

Benefits

• Stops coolant leaks caused by cracked or corroded expansion plugs
• Restores proper sealing integrity to the engine block or cylinder head
• Reduces the risk of repeat repairs with reliable materials
• Ensures smoother installation with OE-matched dimensions
• Helps maintain optimal engine cooling system pressure
• Provides a cost-effective solution compared to dealer parts

Application

This part is ideal for mechanics and DIY enthusiasts performing engine overheating repairs, coolant system maintenance, or full engine rebuilds on vehicles requiring a 1-5/8 inch steel cup plug.

Fitment Notes

• Compatible with various Chrysler, General Motors, American Motors, and Navistar applications
• Replaces part numbers including 5203342, 94673017, 733598, and 3826504
• Verify specific vehicle fitment using the part number 555-030 before purchase

Why Choose Dorman - Autograde?

• Dorman parts are engineered as direct-fit replacements designed to match OE form, fit, and function
• Products are validated through rigorous testing to stand up to daily driving demands
• Supported by a team of product experts in the United States

What's in the Box

• 10 Piece Set of Steel Cup Expansion Plugs

Item Dimensions

• Package Length: 4.9 inches
• Package Width: 3.6 inches
• Package Height: 2.2 inches
• Weight: 0.7 lbs