I need an O-ring for my Central Hydraulics Harbor Freight Jack Model 42820 2.5 ton Lone Frame Floor Jack. Its the Release Valve Seal. Harbor Freight says its discontinued. The O-ring is not an O-ring but more like a short piece of fuel line cut about 1/4" long. Tried Napa, Carquest, Harbor Freight Parts and compressor repair shop with no luck. My next step is a stop leak. Is there a stop leak for hydraulic oil?