OKO Mining Xtra-Heavy Duty Tyre SealantOKO Mining Xtra Heavy Duty is an essential aid to operators of vehicles that suffer the very harshest off road terrain. Fitting tires with solid polyurethane fill is one solution but it carries a heavy weight penalty, is very expensive and adversely affects the ride, as well as placing a strain on axles. In most cases, extra heavy duty OKO Mining can work as well as solid fill, at a fraction of the cost and with a minimal weight penalty. It seals