Volatility Reducing Agent A stand-alone volatility reduction aid (VRA), WINNERS VRA is an approved VaporGrip Xtra Agent for use with herbicides containing dicamba such as Tavium, Engenia, and XtendiMax. The EPA requires use of an approved pH buffering adjuvant such as WINNERS VRA with each tank-mix solution containing dicamba to reduce the volatility potential. WINNERS VRA is for use on all dicamba sprays.