1/2" Compression X 1/2" MNPT Fitting. This fitting does include 2 silicone o-rings to make a liquid-tight non-permanent connection. This fitting is most often used to connect a 1/2" dip tube to a 1/2" FPT coupler on the inside of a kettle, mash tun or hot liquor tank.

By popular demand; these fittings are now bored-through.  This means the tubing will slide all the way through the fitting.  This allows for a little more positioning adjustment of the dip tube and allows the compression fitting to be used for other applications where you want the tubing to pass clean through.