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Application: Used to seal the valve tappet inspection opening, helping retain engine oil while allowing access for valve clearance adjustment. Material: Made from aluminum, offering stable strength and heat resistance suitable for motorcycle and ATV engine environments. Size Details: Thread diameter is approximately 35.5 mm, outer cap diameter is about 45.5 mm, and wrench size is 24 mm for installation or removal. Compatibility: Compatible with Honda CT125, ATC200X, XR185, XL250, and CB100 models, replacing OEM part numbers 12361-383-000 and 91303-107-000. Replacement Purpose: Designed to replace damaged, missing, or leaking tappet cover plugs during routine maintenance or engine servicing.