Nitrogen Mini Keg Conversion Kit - Nitro Coffee & Espresso MartiniUse this kit to convert your existing iKegger Pro tap (ball lock) system over to using nitrogen or n2o cream bulbs bulbs for when you want to pour a perfect Espresso Martini, nitro cold brew coffee or anything nitro on tap. You need to remove the gas post of the ball lock spear and replace it with this bulb inlet valve. You will also need a stout spout or stout tap to get the cascading head.