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TIllotson .375 Body Channel Welch Plug
179-55 TIllotson .375" Body Channel Welch Plug
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TIllotson .375 Body Channel Welch Plug

Part Number: 179-55
Online Price: $0.79
179-55 Tillotson .375" Body Channel Welch Plug
Availability: Out of Stock.

Description

179-55 Tillotson .375" Welch Plug – OE Body Channel Plug for HL & HR Carburetors


The 179-55 Tillotson Welch Plug (also referred to as a soft plug) is designed to seal internal fuel circuit wells inside a wide range of Tillotson HL and HR series carburetors. This plug is typically used to cover the low-side fuel circuit, although in some applications, it may also seal high-speed circuits or even nozzle wells.

Tillotson’s factory-installed Welch plugs are often sealed with epoxy, but epoxy is not required for rebuilds if the plug is properly installed using the 753 Welch Plug 


Installation Punch. This tool expands the soft aluminum plug to form a secure, leak-free seal inside the fuel channel.


Key Features:

  • OE Tillotson .375" Welch Plug for HL & HR series carburetors
  • Seals internal fuel passages — low-side, high-side, or nozzle
  • Soft aluminum construction for easy and secure expansion
  • Designed for use with the Tillotson 753 installation punch
  • No epoxy required when installed correctly
  • Trusted for high-performance racing and professional rebuilds


Installation Tip:

Always use the 753 Welch Plug Punch to expand the plug into the carburetor body. This creates a uniform, pressure-tight seal. Avoid hammering or improvised tools, which may damage the plug or carburetor casting.


Compatibility:

The 179-55 Welch Plug fits a wide range of Tillotson HL and HR carburetors, including but not limited to:

  • HL Series:
    HL-1A, HL-129E, HL-132H, HL-166B/C, HL-189F, HL-227A/E, HL-229A, HL-231E, HL-232E,
    HL-250A/B/C/D/E, HL-274E, HL-292G, HL-293A/F, HL-299E/G, HL-304E, HL-306A,
    HL-324A, HL-334A/AA/AB/B, HL-WX, WXA, WXG, HL-339A, HL-341A, HL-342A,
    HL-352A, HL-366A, HL-371A, HL-383A, HL-384A/B, HL-385A, HL-388A, HL-395A
  • HR Series:
    HR-181B, HR-184A, HR-190A, HR-191C, HR-191G, HR-196A

(Always verify your carb model or measure your existing plug diameter before ordering.)


Specifications:

  • Diameter: .375"
  • Material: Soft aluminum
  • Installation Tool: Tillotson 753 Welch Plug Punch
  • Application: Seals fuel circuit wells in HL/HR carburetors

FAQ

Q1: What does the 179-55 Tillotson Welch Plug do?

A: This .375" soft plug is used to seal internal fuel circuit wells in HL and HR series carburetors. It’s most commonly used on the low-side fuel circuit, but it may also cover high-speed or nozzle channels, depending on the model.


Q2: Do I need epoxy to install this plug?

A: No. While Tillotson uses epoxy at the factory, it is not required when using the proper installation tool — the Tillotson 753 Welch Plug Punch.


Q3: How is this plug installed?

A: Use the 753 plug punch to carefully expand the soft aluminum plug into the carburetor’s fuel well. This creates a tight, leak-proof seal. Avoid using improvised tools or excessive force, which could damage your carb body.


Q4: Which carburetors does the 179-55 plug fit?

A: It fits dozens of HL and HR carburetors, including:

  • HL-1A, HL-132H, HL-227A, HL-250E, HL-299G, HL-334AB
  • HR-181B, HR-190A, HR-196A, and many more.
    Refer to your service manual or confirm the plug diameter before ordering.


Q5: What are the specs of the 179-55 Welch Plug?

A:

  • Diameter: .375"
  • Material: Soft aluminum
  • Application: Fuel circuit sealing
  • Tool Required: Tillotson 753 Welch Plug Installation Punch

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