Dura 040-SCB 6" Green Square Grate with 4" Adapter Basin. Dura Plastic Products provides users with high-quality plastic drainage products engineered with a durable Polypropylene construction. Dura takes pride in implementing changes to better their products, and deliver users with the best possible product in the market. Dura follows their Quality by Design motto, and it has allowed the family owned business to be recognized as an industry leader. This Dura 040-SCB 6" Green Square Grate with 4" Adapter Basin is formed out of High Density Polyethylene, a heavy duty plastic material. Polyethylene also includes UV Protection that keeps the grate from sun damage and fading. This square grate attaches directly to PVC Sewer, and Drain Pipes. This Square Drainage Grate Adapter installs easily, and can be replaced easily. This Grate Adapter increases flow and blocks large debris from entering your drainage system. This 4"x6" Square Adapter Grate comes in Green with a Black Base.