The McAlpine S21A is a multifit caulking ferrule with a 2" solvent weld fitting and a 1 1/4" BSP male thread. It is designed to provide a secure and leak-free connection between a 2" waste pipe and a 1 1/4" BSP threaded fitting. The caulking ferrule is made of high-quality materials that ensure durability and long-lasting performance. It is easy to install and provides a reliable and secure connection that is resistant to vibration and movement. ・ Available in 1¼", 1½", and 2" sizes ・ Multifit Fittings suit all plastic waste pipes to BS EN 1451-1:2017 and BS EN 1329-1:2020 and copper pipe and lead pipe