PLUMBING SUPPLIES AND FIXTURES IN BIRMINGHAM AND HUNTSVILLE, AL GLS Is Your Plumbing Solution. From supplying local Birmingham and Huntsville plumbing professionals with all the materials they need, to assisting local homeowners and interior designers in creating their dream home, GLS Supply is here for all your plumbing supply needs. From the moment you step in the door, you’re immediately a part of the GLS family. We cater to our customers and strive for your total satisfaction with each and every project. While providing a wide array of plumbing materials and kitchen and bath fixtures, we work to give each customer the quality service they deserve at a competitive price.