Streamlight Tail Cap O-Ring for SL15/SL20X Series Flashlights 151706 replaces the front waterproofing ring of your Streamlight SL-20X Flashlight. If you need to replace the rear waterproofing o-ring of an SL-15 or SL-20X flashlight, the Streamlight O-Ring for Tail Cap is the part you need.
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