Bunkerkings Knucklebutt Winner Winner

The BK Knuckle Butt is the perfect combination of ultra-durable tank  protection, advanced shoulder grip grooves and unique Bunker Kings  style. Constructed of anti-tear Elastomer which increases durability and  ease of use. Made to fit all sized tanks The Knuckle Butt’s unique  design lets you quickly check the hydro date of your bottle by simply  rolling the edge without having to remove the whole thing, this gets  your tank approved in seconds, Bunker Kings styling is always the best  part of the Knuckle Butt, designed with sucker-free graphics, straight  from the slick streets of NYC!