4" Ghibson Carbon Steel Check Valve Wafer Type with NBR Seal VS5270The Ghibson Carbon Steel Check Valve Wafer Type VS5270 is a dependable and sturdy 4'' valve. With a reliable wafer type design, this valve provides reliable service with its superior material construction and ensures your system functions as intended. Zinc Plated Carbon Steel Body Stainless Steel Disc 1 to 8 Zinc Plated Carbon Steel Disc 10 & 12. Temperatures: NBR 0C to 95C,