|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.
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in section "Valves"