P to transfer the bad odours of wc, as well as of the toilet in which this invention is located, a circuit for air25, 5, 4, 6 is formed between the cuvette22 and the conduit of vidange2 of wc. This circuit passes through the reservoir of chasse24 and can be closed by a valve of aspiration8 forming a check valve - return and logee in a casing mounted in the space of air3 of the reservoir of flushing. This valve opens the circuit of the rinse when the pressure of the dimension of the discharge conduit is lower that of the other dimension. The casing comprises a ventilateur4 which serves to produce a negative pressure of the dimension of the emptying. The interrupteur13 which controls the fan is the same as that used for torches the toilet. / p
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