Tillotson 179-55 Welch Plug 0.375 Inch Body Channel Plug

The Tillotson 179-55 is a 0.375-inch (3/8") body channel welch plug designed for Tillotson HL and HR series carburetors. This essential carburetor component seals internal fuel passages and provides access to critical idle and main fuel circuits during carburetor maintenance and rebuilding.

Key Features:

• Precision-sized 0.375-inch diameter for proper fit
• Designed specifically for Tillotson HL and HR carburetor series
• Seals body channels and fuel passages
• Essential replacement part during carburetor rebuild
• Provides access to clean internal passages and ports

Welch plugs are thin, dome-shaped metal discs that cover internal passages in carburetors. During a thorough carburetor rebuild, these plugs should be removed to allow complete cleaning of the fuel circuits underneath, where debris, varnish, or corrosion can accumulate and cause performance issues. Once the passages are cleaned, new welch plugs are installed dome-side out and seated by flattening the dome to create a secure seal.

Application: Compatible with Tillotson HL and HR series carburetors commonly found on chainsaws, snowmobiles, go-karts, and other small engines. This part is typically sold individually and is included in most complete carburetor rebuild kits.