McAlpine S16 1.25" x 1" trap inlet reducer is a plumbing fitting designed to reducer the size of a trap inlet connection from 1 1/4" to 1". With a 1 1/4" end fitting over the trap inlet and a 1" end connecting to the pipe, it guarantees a secure, leak-free joint. This reducer is commonly used in plumbing setups where a smaller pipe connection is needed.