Thomas & Betts 1944 CHASE Conduit Nipple. Brand: Thomas & Betts. Part Number: 1944. T&B CHASE Conduit Nipple, Bushed, 1 in, For Use With: Rigid/IMC Conduits, Malleable Iron, Chromate Coated/Electro-Zinc Plated, 21/32 in Dia x 1-7/16 in L. Additional Description: TB -1944 1 INCH INSUL CHASE NIPPLE. Catalog Description: 1 Inch Chase Nipple, Malleable Iron, Nylon Insulated for Use with Rigid/IMC Conduit.