1", 2 piece, pvc electrical conduit expansion coupling, designed to compensate for length changes due to temperature variations in exposed applications of conduit runs, for use with schedule 40 & 80 conduit, features exclusive molded in mid-point indicator on the piston, exclusive 1" expansion fitting with 4" travel distance, 2 piece molded design with lubricated seals for easier movement for the life of the product, 2 o-rings to prevent leakage, can be installed vertically or horizontally.