The McAlpine S23 is a blank cap with a nut for BSP threads. It is designed to be used to close off an unused threaded outlet or fitting in a plumbing system. The cap and nut are made of high-quality materials that ensure durability and long-lasting performance. The nut provides a secure and leak-free connection that is resistant to vibration and movement. This product is commonly used in plumbing installations where there are unused threaded outlets or fittings that need to be capped off to prevent water leaks or other issues. ・ Available in 1¼", 1½", and 2" sizes