It’s smaller than the original but where the o ring goes which seals the oil in is the correct diameter. Make sure u put the fill plug in the up position if you install it with the pump off.
I AM WORKING WITH ABOUT (3) THREE SEA DOO JET SKI AND I WILL TRAY TO USED IT IN ONE OF THEM BECAUSE I WAS DEALING AND WORKING WITH BACK, IMPELLER AND IT WAS A LITTLE DAMAGE.