PolySeal Growler Screw Caps (38-400 CT)

These heavy duty 38 mm screw caps will fit any bottle or jug with a 38-400 CT thread.  They're designed to seal exceptionally well and will prevent leaks or oxidation of your beverages.  The cone shaped liner is made from an oil-resistant plastic that resists odors and chemicals in order to keep your products ultra-fresh.These black screw caps are great for jugs, growlers, and more!  We highly recommend using these over the standard metal growler cap for both a superior seal and preservation of your home brew. 38-400 (38/400) CT continuous thread screw caps