of freedom may allow the blade to maintain an ideal orientation despite variations in tube od the upper ends on the range are merely a matter of convenience to keep the blade in an orientation close enough so that the applying to the pipe can bring the blade into a more exact alignment thus although only 1 u00b0 or so may be desired needed even 10 u00b0 or more may not be detrimental these variations may not merely be tolerances but rather variations associated with use on different nominal sizes of tube exemplary tube outer diameter is 1 5 inch or greater 38 mm or greater exemplary tube and electrofusion fitting materials are polyethylene pe e g hdpe or ldpe polypropylene pp polyvinyl chloride pvc and the like to evacuate material cut from the groove the exemplary blade comprises a channel or passageway 90 extending from an opening 92 in the inboard face 58 to an opening 94 in the second end face 52 as the blade is drawn along the pipe the edge 84 cuts a curl 99 fig5 of material which then can pass through the opening 92 and out the opening 94 the exemplary blade material is steel the blade may be machined from strip or bar stock for example the stock may have a thickness corresponding to the dimension between the faces 54 and 56 and another dimension corresponding to an overall height between the face 60 and at least the edge 84 the remaining surface 58 may be machined to create the portion 64 leaving the.