MAN B&W.L28-32.031 Filter Element DN25, for Fuel safety filter SL13-577/KEL. MAN B&W.L28-32.029 Gasket,DN 25 for fuel oil filter element duplex filter MAN B&W.L28-32.014 O-ring, DN 25 MAN B&W.L28-32.020 O-ring, DN 25