a hot sprue bushing is provided for transporting plasticized material from an injection nozzle to a mold cavity while controlling the temperature of the plasticized material . this hot sprue bushing comprises an elongate body having a head , a stem and a distal end portion , and a through passage extending therethrough from end to end through the head , stem and distal end portion of the body for transporting plasticized material through the hot sprue bushing from the heat to the distal end portion thereof . the distal end portion of the body bears a first engaging device , and the head of the body is of greater cross - section than the stem so that the head provides a first abutment surface extending outwardly of the stem . an electrically powered heater is wrapped around the stem of the head in heating conducting relationship therewith . a sleeve surrounds the electrically powered heater ; and a tip member has a second engaging device engaged with the first engaging device on the distal end portion of the body , the tip member having a second abutment surface engaged with one end of the sleeve so as to urge the opposed end of the sleeve into engagement with the first abutment surface on the head . the tip member permits egress of plasticized material from the through passage in the body .