3812159 Alternator D-30 Drive Belt for Penta D1 D2 Marine Engines 21951188 This drive belt is designed to fit marine engine models Penta D1 and D2.It is engineered for use with alternator systems requiring a D-30 profile belt.The part number 3812159 corresponds to the specification, proper fit and function in compatible applications.Also referenced as 21951188, this belt supports power transmission between the engine and alternator.It is built to withstand typical operating conditions found in marine environments.Installation requires standard mechanical tools and adherence to guidelines. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.