【EXPANDABLE & FLEXIBLE P-TRAP】Sink drain pipe adjustable length range from 7.5"(190mm) to 17.7"(450mm); 1-1/2" nut ID is 1.77"(45mm); 1-1/4" nut adapter ID is 1.53"(39mm). Each nut has a female thread and is NOT a slip joint. It can only be used with male threaded sink drain or adapters, and cannot be compatible with pipes without threads. 【NOTE】1-1/2" represents the INSIDE DIAMETER of the SINK DRAIN HOLE SIZE, not the pipe size. Don't get confused with the SINK DRAIN HOLE SIZE and the ACTUAL PIPE SIZE. 【LONGEVITY & RELIABILITY】P trap sink drain pipe is made of plastic material with good corrosion and temperature tolerance. Deep threads on the nutcracker allow for a tight bite. 【DIY & SPACE SAVING】Flexible Sink drain pipe making it easy to install and fit into tight spaces, solve your problem that sink can't line up properly with the plumbing. 【EASY REMOVAL & INSTALLATION】No need for figuring heights and angles or to cut and glue, p trap drain pipe achieves quick and tight fitting. 【VERSATILITY FOR DIFFERENT SINKS】Expandable and flexible p trap compatible with both 1-1/2" or 1-1/4" pipes. Sink drain pipe can be widely used in bathroom, kitchen drain sinks. 【COMPLETE INSTALLATION KIT】Sink drain pipe kit comes with white 1-1/2" flexible p trap 1 PCS, 1-1/4" adapter 2 PCS , and s-shaped fixed buckle 1 PCS and sealing rubber ring 6 PCS, sealing tape included.