The McAlpine 1 1/4" Multifit Loose Nut S8M is a plumbing fitting made by McAlpine that is used to connect pipes in waste and drainage systems. The "1 1/4"" measurement refers to the diameter of the pipe that the fitting is designed to connect to. The "Multifit" designation indicates that the fitting is designed to be versatile and can be used with a variety of pipe materials, including copper, lead, and PVC. The "Loose Nut" designation indicates that the fitting has a threaded connection with a loose nut that can be tightened or loosened by hand. This allows for quick and easy installation and removal of the fitting. The "S8M" model number likely refers to a specific variant or version of the fitting. Overall, the McAlpine 1 1/4" Multifit Loose Nut S8M is a specific plumbing fitting that may be useful in certain waste and drainage systems where a versatile fitting with a threaded connection is required to connect pipes or other plumbing components, and where easy installation and removal is desired. 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.