21mm Stainless Steel Frost Plug for Engine Block Coolant System SKU: QT32417156SS

A damaged or missing frost plug creates immediate problems—coolant loss that leads to overheating, contamination entering the cooling system, and potential freeze damage during cold weather. This precision-sized 21mm stainless steel frost plug seals the engine block opening to maintain proper coolant system pressure and prevent costly engine damage.

Key Benefits

• Stainless steel construction resists corrosion and provides superior durability compared to standard steel plugs
• Precise 21mm sizing ensures proper fit and reliable seal in the engine block casting
• Handles freeze-thaw cycles and thermal expansion without cracking or failing
• Universal application for engines requiring 21mm frost plug replacement

Don't let a simple frost plug failure sideline your equipment when the work needs to get done. S&H Parts has the right seal for your cooling system repair, backed by over five decades of parts expertise.