The Wall Mount 3 and Wall Mount 4 receive a breath sample from the donor via a disposable straw (wrapped or unwrapped) which is inserted into the sample port.The sample system in the Wall Mount 3 and Wall Mount 4 has a non-return valve flap to reduce the possibility of suck back by the donor, as shown in Figure 2 below. The non-return valve is in close proximity to where the straw creates contact with the inlet body, helping to keep the volume of saliva as low as possible.

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