Conduit Threaded Hub; Type Threaded; Throat Type Insulated; Trade Size 2-1/2 Inch; Size 3-1/4 Inch Dia x 2-9/16 Inch L; Constructional Feature Concrete-Tight, Watertight; Material Ball Burnished Mirror Smooth Die-Cast Zinc Body, Buna N Sealing Ring; Approval UL 514B, UL (Canada and US), CSA; Used On IMC/Rigid Conduit; ROHS Compliant; Applicable Standard Federal Specification A-A-50553, NEMA FB-1; Insulation Temperature 105 Deg C