Hurricanes boss Mark Hammett has slammed the Bulls' rolling mauls, labelling the practice "completely illegal" on Thursday ahead of the two teams' meeting this weekend.
Hammett has grown frustrated by the tactic, which bore fruit against New Zealand rivals the Chiefs last week, yielding a penalty try and a try, but admits a change in the laws is highly unlikely.
''The rolling maul is completely illegal in terms of how it's set up, but I've talked to refs numerous times and numerous other coaches have done that as well, but it's something at the moment they [the referees] aren't prepared to change," Hammett told stuff.co.nz.
''The biggest issue isn't around the maul, it's the entry of players coming in, in front of the ball carrier and it's done continuously.
''I don't think it's something that will change midseason, if at all.''
And though the Hurricane's boss has seen how effective a maul can prove, he says his team can halt the Bulls in their tracks in Napier on Saturday with the right defensive approach.
'You have to stop it at the source," added Hammett.
"Whether it's getting up in the air or stopping it before the train gets moving.''