Dura UA-Plug Drainage Plug. 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 UA-Plug Drainage Plug is a replacement part that connects to square drainage basins. This Drainage Plug connects easily to the basin, and can be removed easily also. This Adapter comes in black, and is formed out of High Density Polyethylene.