I have an older jack , heavy frame that I believe is a walker. It has a tag that reads 2 ton capacity , serial # E-666 I06022. It also has a non working air over hydraulic pump. Jack is gray in color with a tee type handle that has like bicycle hand grips and a white colored knob to control descent. Unfortunately I am unable to post a picture. I was wondering what model that may be and how to go about getting seals.