SEI SE228 Lower Unit for Mercury Verado Counter RotationThe SEI SE228 is an aftermarket replacement lower unit for select Mercury Verado inline four-cylinder and inline six-cylinder four-stroke outboards requiring counter rotation. These versions feature a 20-spline driveshaft, 15-spline propeller shaft, and 4.88" torpedo housing. Choose the gear ratio and shaft-length combination that matches your existing lower unit and engine application.This item is subject to a 20% restocking fee.Year, serial number, and horsepower are required to process your order. Please contact us with this information after placing your order. Processing will be delayed until this information is received.Features Aftermarket replacement for select Mercury Verado four-stroke lower units; Counter rotation for compatible applications; 20-spline driveshaft and 15-spline propeller shaft; 4.88" torpedo housing; Four gear ratio and shaft-length combinations available; Applications by Gear Ratio 1.75:1: Select 2.6L inline six-cylinder Verado 300 HP applications; available for 25" and 30" shaft lengths; 1.85:1: Select 2.6L inline six-cylinder Verado 200275 HP applications; available for 30" shaft lengths; 2.08:1: Select 1.7L supercharged inline four-cylinder Verado 135200 HP applications; available for 25" shaft lengths; Fitment and Option SelectionConfirm your engine serial number, rotation, existing gear ratio, shaft-length designation, and gearcase type before ordering. Horsepower alone does not establish compatibility.This listing is for counter-rotation applications only. The listed applications are inline four-cylinder and inline six-cylinder engines; they do not establish fitment for V6 or V8 four-stroke Verado engines.