Patent ID: 8307706

Claim:
A combination of a marine steering fluid system sight gauge and a marine hydraulic steering fluid system, comprising: a marine hydraulic steering fluid system; a hollow body having an annular first end, a second end, and a substantially transparent intermediate portion extending between said first end and said second end; said intermediate portion having walls having a thickness of 1/16 inch or more; a reservoir located inside said hollow body extending from said first end to said second end, said reservoir having a generally uniform diameter along a majority of a length of the reservoir; said annular first end having external threads formed on an outer surface of said annular first end, said annular first end having an opening connecting with said reservoir, said annular first end having a diameter which is less than a maximum diameter of said intermediate portion, said annular first end external threads being sized and adapted to be fitted into and engaged with a threaded aperture of the marine steering fluid system; sealing means provided on said annular first end for sealing said hollow body against the threaded aperture of the marine steering fluid system; said second end having internal threads formed on an inner surface of said annular second end and a second opening in said second end connecting with said reservoir, said second opening being larger than said first opening; a marine steering fluid system cap which includes a threaded cylindrical plug, second sealing means provided on said threaded cylindrical plug for sealing said cap against the annular second end, and a finger-grippable knob, second end internal threads being adapted and sized to engage the threaded cylindrical plug of the marine steering fluid system cap.