... comfortable living environment on board-Easy Installation and Periodical Inspection is especially reduced duct lip and has a structure ... outer surface of duct for installation, On the periodical inspection, it is almostnot needed to change parts except seal.- ... CPPMTT22522501200~1550235FPP,CPPMTT25025001450~2100326FPP,CPPMTT27527502060~2480378FPP,CPPMTT30030002300~2930462FPP,CPP Marine Bow Thruster