| 摘要 |
An eductor (1) having an air gap (5), a venturi structure (3), and a non-return valve (19) located in the air gap (5). The non-return valve is removable and allows the eductor to be operated as an air gap eductor or a non-return valve eductor. A non-return valve cartridge (19) for installing in to the air gap (5) of an air gap eductor (1), so that the eductor can be operated as a non-return valve eductor. A method of retrofitting a non-return valve (19) in an air gap eductor (1).
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