The 4" PVC Pipe Fit Primer Tapped Base with a 3-1/2" spud connection is designed for efficient plumbing installations. This base is made from high-quality PVC, ensuring durability and resistance to corrosion. The 4" size is compatible with standard PVC piping, making it ideal for various drainage and waste applications. The 3-1/2" spud connection allows for easy attachment to fixtures, ensuring a secure and leak-free fit. This product meets industry standards for plumbing systems, making it a reliable choice for both residential and commercial projects.