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Engine freeze plug. Designed for 50 mm bores, compatible with Cunewalder M24 and M25 engines. Confirms fit where 50 mm core plugs are specified to restore coolant sealing without modification. Core plug 50 mm. Galvanized iron body resists rust in coolant passages, machined rim supports a tight press fit and consistent seating depth in the engine block opening. Expansion plug. Replaces worn or corroded core plugs to stop coolant seepage, supports engine rebuilds and scheduled service. Seals casting holes when properly installed. Engine repair kit. Useful for home garage fixes, workshop overhauls and field maintenance. Supports small equipment using 50 mm core plugs in compact engines and stationary power units. Set of 4 plugs. Measure the block bore at 50 mm before installation, clean the seat and press evenly with a driver tool. No OEM number required when the size and model match.