A refill component is provided for a multi-part sterilant system including apumphead having a peristaltic pump member, a first-part dispensing tube and asecond-partdispensing tube. The refill component comprises:a first part comprising a first reagent in a carrier medium in a firstcollapsiblecontainer；a second part comprising a second reagent in a carrier medium in a secondcollapsible container；wherein the first reagent and the second reagent will react to provide asterilisingcomposition when the first part is mixed with the second part.Each container (80) is secured to a collar member (78), the collar member (78)having, for each container, an opening which is aligned with an opening of thecontainer(80) to receive a corresponding dispensing tube from a pump head.The open end of each container (80) has a neck portion (84) and a lip (86),and eachopening in the collar member is dimensioned to support the lip (86) of acontainer (80)and has a slot portion (82) which extends to an edge of the collar member (78)forslidably receiving the neck portion (84) of a container (80).
