This glow plug is suitable for a wide range of Volvo Penta D1 and D2 marine diesel engines. It replaces Volvo Penta part number 21192358 and Perkins 185366250 . Electrical Specifications Voltage: 12V Glow plug voltage: 11V Current: 6A Glow time: 8.5 seconds Physical Specifications Total length (L1): 69 mm Heating element length (L2): 19 mm Thread size: M8 x 1.00 Hex size: 12 mm Replaces OEM Part Numbers Volvo Penta 21192358 Perkins 185366250 Compatible Volvo Penta Engines D1 Series D1-13 D1-13B D1-13F D1-20 D1-20B D1-20F D1-30 D1-30B D1-30F D2 Series D2-40 D2-40B D2-40F Questions about compatibility or installation? Our marine specialists are happy to help.