Buy 2010 Nissan Altima COUPE S 2.5L MT Engine Core Plug. Piston, crankshaft and flywheel. Head, Welch, Taper - OEM Nissan Part # 12205-40F00 (12205-21000, 12205-21010, 12205-40F01, 1220540F00)

Engine Expansion Plug. Engine Freeze Plug. Engine Welch Plug. Plug Crankshaft Oil Hole. Plug Taper.
Plug Thread.
Plug that prevents the engine block or cylinder head from cracking in case of freezing coolant. Also used to plug the casting holes from production.

PLUG-THREADPLUG-TAPERPLUG-CRANKSHAFT OIL HOLE