Adaptor for R-Tube exhaled breath condensate (EBC) collection device for use in infants. This adaptor reduces the dead-space of the device to be suitable for EBC collection in infants according to European Respiratory Society guidelines. The mouthpiece and 'Tee' section of the R-Tube can be removed and replaced with this adaptor, which can connect to an infant size 1 Laerdal facemask and one-way valve.