This cap fits the pressure barrels with a 4-inch neck (Such as King Keg) and has a pin for use with the 8g CO2 bulbs. It must not be used with the Hambelton Bard S30 cylinders. It comes fitted with all seals, including pressure release. It is recommended that you put a little vaseline on the cap's threads, before screwing onto the barrel, to help achieve a gas-tight seal.
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