Abstract: A turbine dosing sealing arrangement is disclosed. The sealing arrangement comprises a sealing member and a conduit. The sealing member is configured to engage a turbine housing element at an interface. The conduit projects from the sealing member, the conduit defining at least part of a reductant fluid pathway across the interface.

Abstract: An adapter element for a turbine is disclosed. The adapter element defines a longitudinal axis and comprises a first connection portion, a second connection portion, an outer wall and a dosing structure. The first connection portion is configured to engage the turbine. The second connection portion is configured to engage a conduit. The outer wall extends between the first and second connection portions, the outer wall defining an inner surface and an outer surface. The dosing structure is configured to receive, and expel, reductant.