Item Type: Water Pump Impeller Repair Kit Material: Stainless Steel + Neoprene Rubber Compound Set Includes: Impeller, washer, wear plate, sealing bracket, seal and casing OEM: 817275Q05 817275Q4 817275K05 817275A4 Serial Number: Replacement for Sierra Marine 18-3147 Mallory Marine 9-48315 GLM 12414 Fitment: Replacement for 200 225 250 Mercruiser Alpha 1 One I Generation 2 II Two SternDrives from 1991-2021 To provide higher flow and cooling flow to protect your engine and extend its service life, high quality impellers are manufactured to high specifications using precise rubber compounds as raw materials.1Fitment: Replacement for 200 225 250 Mercruiser Alpha 1 One I Generation 2 II Two SternDrives from 1991?2021 2Part Number: OEM: 817275Q05 817275Q4 817275K05 817275A4, replacement for Sierra Marine 18?3147. 3Function: Can provide higher flow rates and cooling flow to protect outboard engine, and easy to install. 4Package: The whole water pump rebuild kit includes impeller, housing gasket, housing, plate, O?Ring, etc. 5Material: The impeller is made from a neoprene rubber compound to make sure durability and reliability. 1 xWaterPumpImpellerRepairKit (15pcs)