Rotor Lubricants: 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. The 22 ml long-tipped precision needle oiler facilitates application through the slide tubes. Available in two nontoxic, non-gumming viscosity grades: 11. LIGHT ROTOR - Formulated specifically for close tolerance rotors. PN: H11-LR