Engine Block Core Plug - 21mm Universal Freeze Plug SKU: QT32417156

A failed or corroded freeze plug allows coolant to leak from the engine block, leading to overheating, engine damage, and costly repairs. This precision-engineered 21mm core plug restores the factory seal your engine cooling system needs to maintain proper operating temperatures.

Why Genuine Matters

• Exact 21mm diameter ensures proper interference fit in engine casting
• Corrosion-resistant materials withstand coolant chemicals and temperature cycles
• Factory-spec thickness provides reliable long-term sealing without deformation
• Universal design fits common tractor and small engine applications

A small coolant leak becomes a major headache fast—protect your engine investment with the right replacement part. When you need expert advice on fitment or installation, S&H Parts has been solving these problems since 1969.