31 Stainless Steel Cap Screw; For Optimal Corrosion Protection Supplied With Bolts to Ease Installation Drain Hole to Reduce Moisture Build Up Inside Cap End Cap Assembly; Bolt On; Closed Type; 305 Stainless Steel Material; BEC-23 Two or Four Bolt Flange Compatible Housing; 1.End Cap Assembly; Bolt On; Closed Type; 305 Stainless Steel Material;BEC-23 Two or Four Bolt Flange 8-32 X 0.