The SPI UniBung is crafted from high-quality rubber, ensuring durability and flexibility. This material provides an effective seal, preventing leaks and minimizing the risk of damage during use. Whether you're working on a tank or radiator, the SPI UniBung is up to the task. Equipped with both 15mm and 22mm End Cap Bungs, this kit caters to a range of plumbing scenarios. The 15mm and 22mm sizes ensure compatibility with different plumbing fixtures, offering you a versatile solution that can adapt to various systems. Superior Rubber Construction: Crafted from top-quality rubber, the SPI UniBung offers a winning combination of durability and flexibility. This ensures a reliable seal, effectively preventing leaks and minimizing the risk of damage during use. Whether you're working on a tank or radiator, count on the SPI UniBung to deliver resilient performance. Dual-Size End Cap Bungs: Equipped with both 15mm and 22mm End Cap Bungs, this kit adapts to a variety of plumbing scenarios. Th