26-88397A1 Upper Driveshaft Housing Gearbox Seal Kit for Mercruiser Quicksilver Alpha One Gen II 2 88397A1 18-2644 The 26-88397A1 Upper Driveshaft Housing Gearbox Seal Kit is designed for use with Mercruiser Alpha One Gen II stern drive motors.Constructed with XRmarine material, the seals offer temperature resistance up to 105℃, supporting in marine conditions.The kit is engineered to fit specific Mercruiser models, proper alignment and function within the driveshaft housing.This seal kit serves as a direct replacement for OEM 26-88397A1 and equivalent to Sierra 18-2644.It includes all necessary components for installation, allowing for efficient servicing of the upper driveshaft area.Designed for compatibility with Mercruiser Quicksilver Alpha One Gen II systems, the kit supports consistent performance and water ingress and lubricant leakage.The seals are built to resist wear from regular use, contributing to the long-term of the drivetrain.With precise dimensions and materials, the kit integrates smoothly into existing configurations, maintaining functional integrity and appearance.This replacement solution supports dependable across various marine conditions, from calm lakes to open waters.