Thomas & Betts 5266 Liquidtight Sealing Gasket Brand: Thomas & Betts. Part Number: 5266. T&B Sealing Gasket, 1-1/2 in, For Use With: Liquid Tight Flexible Metal Conduits, 316 Stainless Steel, Gray, 2-7/16 in OD x 15/64 in THK. Additional Description: TB -5266 RING SEALING 1 1/2 RUBBER W/ST RETAINER. Catalog Description: Liquidtight Sealing Gasket, 1-1/2 Inch, with 316 Stainless Steel Retainer Ring and Thermoplastic Molded Seals..