This 2-1/2" to 4" Extension is specifically designed for 3-1/2" drain or cleanout spuds, providing a reliable solution for plumbing installations. Constructed from high-quality materials, this extension ensures durability and long-lasting performance. Its versatile design allows for easy adjustments and compatibility with various plumbing systems. This product meets all relevant industry standards, making it a dependable choice for both residential and commercial applications. Ideal for enhancing drainage efficiency and accessibility.