Looking like a giant icing bag it performs very much the same process. Simply fill the bag with mortar using a good plasticiser and squeeze out in between bricks or slabs. The bag itself is of seamless heavy-duty black vinyl and is fitted with a steel exit nozzle with a 9.5mm hole. The bag is 600mm long and the top diameter is 225mm. To clean simply turn inside out and hose off any mortar remaining on the bag.