F01N 13/005

Exhaust or silencing apparatus characterised by constructional features {; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups [CPC: F01N1/00] - [CPC: F01N5/00], [CPC: F01N9/00], [CPC: F01N11/00] specially adapted for marine propulsion, i.e. for receiving simultaneously engine exhaust gases and engine cooling water with parts constructed of non-metallic material, e.g. of rubber}