Pioneer EPC-16-100 Engine Expansion Plugs 1 Inch Steel 100 Pack

The Pioneer EPC-16-100 engine expansion plugs are professional-grade steel cup-style plugs designed for engine block and cylinder head sealing applications. Also commonly known as freeze plugs or core plugs, these expansion plugs seal the casting holes left during the manufacturing process of engine blocks.

Key Features:

• 1.000 inch (25.4mm) outside diameter fits standard engine block openings
• Steel construction with zinc oxide finish for corrosion resistance
• Cup-style design ensures reliable sealing when properly installed
• Bulk pack of 100 plugs for professional shops and rebuilders
• Universal fit across multiple engine applications

Pioneer expansion plugs are designed by engine rebuilders for demanding professional applications. These steel plugs provide dependable sealing performance during engine rebuilds, cylinder head work, and maintenance procedures. The zinc oxide coating helps protect against rust and corrosion, extending service life. Proper installation requires driving the plug squarely into a clean, properly sized counterbore using an appropriate installation tool and sealant.