matic88888VFD - Epoxy coated ductile iron, wafer style, patented VFD desn with 316 stainless steel poppet and seat and EPDM seal standard. Desned for class 150 and 300 flanges.888VFD - Epoxy coated ductile iron, wafer style, patented VFD desn with 316 stainless steel poppet and seat and EPDM seal standard. Desned for class 150 and 300 flanges.