The McAlpine S23 is a blank cap with a nut for BSP threads, designed to close off unused threaded outlets or fittings in plumbing systems. Constructed from high-quality materials, it ensures durability and long-lasting performance. The included nut provides a secure, leak-free connection that is resistant to vibration and movement. This product is commonly used in plumbing installations to prevent leaks from unused threaded outlets or fittings. Available in 1¼", 1½", and 2" sizes.