20189A Alum Flange 6 Bolt 2″ TTMA. Ensure a solid seal in your petroleum systems with our 20189A Aluminum Flange 6 Bolt 2″. Crafted by Allegheny, this 2-inch TTMA flange features a six-bolt pattern for a robust and leak-resistant connection. Ideal for attaching to tanks and pipes where a secure bond is critical. Suitable for a range of petroleum applications, this flange is available at J&N Supply Co in the Dallas-Fort Worth metroplex.