Method for making polyolefin pipe connector sleeve

A method for press-fitting an open ended tube-like metallic connector sleeve upon a compressible polyolefin pipe end which comprises performing a mechanical rolling or pressing operation on the exterior of the connector sleeve to simultaneously form an external groove and an underlying registering rib at a plurality of axially spaced locations along said sleeve to form a plurality of grooves and ribs axially aligning the connector sleeve having a plurality of circumferentially extending axially spaced internal ribs with an open ended polyolefin pipe end having a plurality of external circumferential grooves axially spaced from one another the same distance as the aforementioned axial spacing of the ribs of said connector sleeve, the external diameter of said pipe end being slightly greater than the internal diameter of said connector sleeve, forcefully moving said pipe end and connector sleeve toward one another to engage one another and causing said pipe end to be compressed and fitted within said connector sleeve and interfitting said ribs of the connector sleeve with the grooves of said pipe end to provide a mating relation and butting the fitted connector sleeve and pipe end to a like connector sleeve and pipe end and connecting the same by a sleeve-like coupling having internal ribs engaging the external grooves in the butted connector sleeves.