CANTEX 3 in. Two Piece Expansion CouplingCANTEX 5144038 is a 3 in. Two Piece Expansion Coupling designed to compensate for length changes due to temperature variations in exposed conduit runs Features: Two piece construction with a 8 inch maximum expansion Internal O ring prevents leakage Durable non conductive PVC will not rust or corrode For use with Schedule 40 & 80 conduit UL listed Made in USA