QualCast 97-126B Brass Expansion Freeze Plug Kit 1.260" OD

The QualCast 97-126B is a brass engine expansion plug, also commonly known as a freeze plug, core plug, or Welsh plug. Designed as a high-quality aftermarket replacement, this plug seals the core sand holes left over from the engine casting process and helps protect the engine block from damage caused by coolant freezing and expanding.

Key Features:

• Material: Brass construction — the preferred choice for marine, performance, and heavy-duty applications due to superior corrosion resistance
• Outside Diameter: 1.260" (1-1/4") — standard cup style
• Manufactured to precise tolerances to ensure a secure, leak-free fit
• Produced in the USA by QualCast, a specialist valve train and engine hardware manufacturer founded in Nashville, Tennessee
• Meets or exceeds OEM material specifications

QualCast expansion plugs are available in standard cup, shallow cup, and concave cup designs across steel, brass, and stainless steel materials. Brass plugs like the 97-126B are especially recommended for applications exposed to moisture, high heat cycles, or corrosive environments.