Abstract: The present invention is directed at a pullhead/reamer for use in digging a hole in the ground; comprising a first end (22) shaped to receive a mandrel struts, connecting the first end to the second end, the struts defining a set of open flutes (48) therewithin; and a set of slurry jets (50); wherein when the pullhead/reamer is in use, the set of slurry jets release a pressurized liquid to mix with the ground producing a slurry which enters the pullhead/reamer via the open flutes.

Abstract: A tool for visually detecting and releasing grease overpressure from a grease nipple comprises a grease coupling in which is formed a vent opening. The grease coupling is carried by an extension tube that extends rearward towards an insert to which it is connected. The insert has a bore in which reciprocates a button bolt. The button bolt extends past a rear face of the insert to an indicator button. A piston extends through the extension tube, from the area of the vent to the button bolt. Grease entering the coupling may exit the vent and may push the piston so as to move the indicator button thus indicating potentially dangerous overpressure.