Thomas & Betts 5331 Liquidtight Conduit Connector Brand: Thomas & Betts. Part Number: 5331. T&B Conduit Connector, Insulated Straight, Series: 53 Series, 3/8 in, For Use With: Liquid Tight Flexible Metal Conduits, Steel, Chromate Coated/Electro-Zinc Plated, 1-1/2 in L x 1-5/32 in W. Additional Description: TB -5331 3/8 IN INSUL LIQ.TIGHT CONN STRAIGH STRAIGH. Catalog Description: 3/8 Inch Straight Steel Insulated Liquidtight Connector..