Butterfly valve is a flagship product Arita, And the warranty 6 months after installation. His own body material is made of: Cast Iron, Stainless Steel, and WCB. For his Disc one of her material: cast iron, SUS 304, SUS 316, and there is made of WCB And for his Seat, his material is made of: EPDM, PTFE, and Metal to Metal Seat Simak Baca secara fonetik