Swap that swollen, brittle plug for Yamaha’s Grommet, Anode 67F-11328-01-00 and let your F-series four-stroke fight corrosion the way the factory intended. This little rubber seat lives inside the cylinder-head water jacket, cradling the pencil anode that keeps salt and minerals from attacking your block. When the grommet hardens, coolant sneaks past, the anode rattles, and galvanic damage goes to work—so changing it during every anode service is cheap insurance.

What sets the OEM grommet apart

• Fuel- and glycol-resistant EPDM stays supple at 200 °F, sealing reliably through wide temperature swings.

• Precision-molded ribs grip the 10 mm anode shaft and 14 mm head bore for a leak-tight, rattle-free fit.

• Drop-in size for 67F powerheads—F115, F130, F150, and many 2.6 L V-six variants—no trimming or RTV.

• Chamfered leading edge guides the anode in straight, protecting delicate threads during quick pit-stop maintenance.

Pop the cowling, pull the pencil anode, press in the fresh grommet, and spin the anode back home—five-minute job, season-long peace of mind. Your cooling passages stay sealed, electrolysis stays outside the metal, and that smooth Yamaha idle stays exactly the way you like it.