A kit including:- a prosthetic vascular conduit (10) for coupling to a prosthetic valve (12) having an annular portion (14) includes a terminal collar member (16), radially expandable to receive the annular portion (14) of the valve (12). The collar member (16) includes a portion (160) which is radially contractible to capture the annular portion (14) of the valve (12) to couple the valve (12) to the conduit (10), and- a dilator element (104) positionable to retain the collar member (16) in a radially expanded configuration and removable away from the collar member (16) so that the collar member (16) embraces the annular portion (14) of the valve.
