The stitching used for the shower pail shall be Type301. Ends of all stitching shall be backstitched or overstitched 1 inch minimum except when caught in other stitching or turned under in a hem. Thread tension shall be maintained so that there
will be no loose bobbin, or top thread, or excessively tight
stitching resulting in puckering of the materials sewn. The inter lock shall be embedded in the material sewn.