Specification: Buttweld reducer •Material:    Carbon steel as PG 370 (JIS G 3454 STPG370) •Surface:    Black paint    I Galvanized •Type:    Concentric / Eccentric sizes of JIS B2312 Butt weld reducer Size D1 Size D2 DN NPS OD (mm) 20 3/4″ 27.2 DN15 25 1″ 34.0 DN20,DN15 32 1-1/4″ 42.7 DN25,DN20,DN15 40 1-1/2″ 48.6 DN32,DN25,DN20,DN15 50 2″ 60.5 DN40,DN32,DN25,DN20