The Fermentap Weldless Mash Keg Conversion Kit is a great way to turn that 15.5 gallon keg you have into an efficient mash tun, or as a very effective whole hop filter in your boil kettle! This kit features 100% stainless steel metal parts, and the gaskets used are made from high temp. and food-grade materials. The ball valve is 1/2" Full Port, so your wort can flow through unrestricted, if you wish. On the backside of the ball valve is a stainless pick-up tube, which allows for the collection of the wort underneath the 10-inch diameter mash screen. This way, you get maximum yield from your mash tun. Requires a 7/8" drill bit to install. Comes with 1/2 inch barb fitting.