Overview Reviews Product Description 38mm Polyseal Screw Cap Polyseal screw caps with polyethelene liner for excellent seal. Fits standard screw top style growlers and jugs with a 38mm closure size. May not fit all brands of growlers and jugs. Product Videos Custom Field Product Reviews Write a Review Write a Review × 38mm Polyseal Screw Cap Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *