Hetman Synthetic Rotor Lubricants provide for long-lasting rotary valve performance. These lubricants will protect rotors and valve casings against corrosion and wear while improving valve seal. Hetman Synthetic Rotor Lubricants will not swell rubber bumpers or damage plastic components. Available in three nontoxic, non-gumming viscosity grades. The new 1 oz. bottle has a dropper tip and is more compact than the old stlye bottle with the metal needle stlye tip.