Overview Reviews Product Description Thomas and Betts TK119A EMT Conduit Compression Coupling Material: Steel Diameter: 3-1/2 Inches. Product Videos Custom Field Size 3-1/2 Material Steel Product Reviews Write a Review Write a Review × Thomas and Betts TK119A EMT Conduit Compression Coupling Material: Steel Diameter: 3-1/2 Inches Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *