Choose Options IronRidge IronRidge SGA Heavy Duty Cast Aluminum Top Caps $39.70 IronRidge SGA Heavy Duty Cast Aluminum Top Caps Our heavy duty cast aluminum IronRidge Top Caps secure quickly and easily to galvanized schedule 40 pipe (ASTM A53 Grade B) or mechanical tubing (i.e. Allied Flo-Coat, Gatorshield, Gatorshield-Plus) piers... Compare Choose Options Add to Wishlist