Abstract: A method of and apparatus for cementing the bore hole of oil and gas wells and the like is provided. The apparatus provides a cementing collar threadedly attachable at each end to a well liner and having an inner sleeve slidably positionable within an outer sleeve. The two sleeves are each provided with openings and ports, respectively, which when radially aligned in register permit fluid to flow from the interior of the inner sleeve to the exterior of the outer sleeve. Radial alignment is effected by means of a series of fingers disposed circumferentially at each end on the inner sleeve and receivable at predetermined locations on the interior surface of the outer sleeve. Means are provided for axially moving the inner sleeve to align the openings with the ports and for thereafter disaligning the same.A method of utilizing the cementing collar apparatus is also provided.