XOMOX (Saunders) High Performance Butterfly Valve - NEW SURPLUS. Model: GA20100N1-1F1F00A, 4 Inch, ANSI Class 300, Material A351CF8M. XOMOX Series 9000 (formerly Saunders MS) Metal Seated Butterfly Valve, Zero Leakage Triple-offset Design in 4 Inch Size Stainless Steel Body, ANSI Class 300 Lug Pattern. This style valve is ideal for critical process applications, steam isolation and severe service applications. Zero Leakage Triple Offset Valves (TOV) are an excellent alternative to gate valves and metal seated ball valves.