Fish Hawk Probe O-RING set Big Fish Encounters Sale! from $4.99 USD /per Replacement o-ring set for X4/X4D probes. Includes two o-rings. The thinner o-ring (size 031) is for the probe body, the thicker (size 130) goes inside the probe cap. Produc variants Default Title Qty. Add to Cart Couldn't load pickup availability Refresh