Specifically formulated for close tolerance piston valves. Hetman® Synthetic Piston Lubricants provide superior wear and corrosion protection for all types of piston valves. Whether your instrument has Monel, stainless steel, or nickel-plated pistons, these long-lasting, non-gumming lubricants will provide for an action that is smooth, quick and consistent. Three nontoxic viscosity grades are available in 60 ml controlled dropper tip bottles.