Welsh Plug 035103111B

Image is an example only, BRAND MAY VARY

A Welsh Plug, also known as a freeze plug or expansion plug, is a small metal disc that is inserted into the engine block of a car. Its primary function is to seal off the openings left during the manufacturing process of the engine block. These openings are necessary for the casting process, but once the engine block is complete, the Welsh Plugs are installed to prevent any leaks or seepage of coolant or oil.

The Welsh Plug plays a crucial role in maintaining the integrity of the engine block. It helps to ensure that the coolant and oil circulate properly throughout the engine, preventing any potential damage or overheating. In case of extreme cold weather conditions, the Welsh Plug also acts as a safety measure by allowing the coolant to expand without causing any cracks or damage to the engine block. Overall, the Welsh Plug is a vital component that helps to maintain the efficiency and functionality of a car's engine.