Pettit Running Gear Guardian 1870 The Pettit Running Gear Guardian helps prevent fouling on any underwater metal running gears. Can be used on Trim Tabs, Propellers, Rudders, Propeller Shafts, Sail Drives, Strainers, BowStern thrusters, Prop Shafts, and other underwater metal or running gear. Provides incredible long lasting protection and is extremely effective. The multi-season dual biocide formula helps prevent all fouling. Has a durable, slick, and ultra smooth finish to keep your performanc