0.375 Inch Welch Plug for Tillotson Carburetor Sealing

Precision sealing transforms a good carb into a great one—enter the 0.375-inch Welch plug, your go-to for plugging idle circuits or calibration holes effectively.

This OEM Tillotson part (SKU: TIL179-55) installs with minimal effort using basic tools, yet delivers maximum impact by isolating passages to fine-tune your engine's behavior.

• Exact 0.375" diameter for snug, leak-proof fit in standard ports.
• Protects against dirt ingress, preserving internal cleanliness.
• Supports experimental jetting setups for personalized power gains.

On the track, that means crisper throttle response and fewer stalls, helping you stay ahead of the pack.