"Applicable scope: The products are used for fire controlling with seawater for shipping. Dimensions of flange are according to JIS B2220 flange dimensions of steel pipe. Materials of major parts 1 - Body - Cast Iron - FC20 2 - Seat - Bronze - BC6 3 - Disc - Bronze - BC6 4 - Stem - Brass - C3771BD" http://www.qdshd-marine.com/