Great Western Seal and Gasket serves as a product catalog for a wide range of ANSI flange gaskets, custom gaskets, and O-rings, highlighting key brands like Garlock and Klingersil. It emphasizes the availability of numerous material options (e.g., Blue-Gard, GYLON, EPDM, Viton) for various industrial applications, including those certified by NSF for potable water. The company also offers sheet goods and specialized items such as API 650 shell and roof manway gaskets, alongside flange kits that include both gaskets and bolts, aiming to provide comprehensive sealing solutions for customers.