TC Bros Steel Weld-In Petcock Bungs (1/4" & 3/8" NPT)

TC Bros Steel Weld-In Petcock Bungs (1/4" & 3/8" NPT)

Name: TC Bros.-Leather Cushion Washers with 3/8 inch Hole 10 pack
Brand: TC Bros
Price: 13.95 CAD
Availability: InStock

$38.95

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Premium Steel Weld-In Petcock Bungs for Custom Motorcycle Fuel and Oil Tanks

TC Bros steel weld-in petcock bungs are essential components for custom motorcycle fuel tank and oil tank fabrication. These precision-manufactured NPT (National Pipe Thread) bungs provide secure, leak-proof mounting points for petcocks and tank fittings. Available in 1/4" and 3/8" NPT sizes to accommodate different petcock and fitting requirements.

Available Sizes:

1/4" NPT - Standard size for many petcocks and oil tank fittings
3/8" NPT - Larger size for higher flow applications and specific fittings

Key Features:

NPT Tapered Threads - National Pipe Thread design creates leak-proof seal when tightened
Premium American Steel - Made from 1018 cold rolled steel for easy, reliable welding
Made in USA - Proudly manufactured in the United States
Easy Installation - Inserts into 3/4" diameter hole and welds around 1" diameter flange
Two Size Options - Choose 1/4" or 3/8" NPT to match your fittings
Sold in Pairs - Each order includes two bungs
Professional Quality - Precision-manufactured for consistent fitment and performance

Choosing the Right Size:

1/4" NPT: The 1/4" NPT size is the most common size for motorcycle fuel tank petcocks and oil tank fittings. This size works with standard petcocks and provides adequate flow for most applications. If you're replacing an existing petcock or using a standard aftermarket petcock, 1/4" NPT is likely the correct size.

3/8" NPT: The 3/8" NPT size offers a larger opening for higher flow applications or when using specific fittings that require the larger thread size. This size is ideal for custom applications, larger displacement engines, or when maximum fuel flow is desired. Always verify your petcock or fitting thread size before ordering.

Understanding NPT Threads:

NPT (National Pipe Thread) threads are tapered, meaning the diameter gradually decreases along the length of the threads. This tapered design is critical for creating a leak-proof seal. As you tighten an NPT fitting into an NPT bung, the tapered threads wedge together, creating a tight, sealed connection.

Important: NPT threads are ONLY designed to be used with corresponding NPT threaded fittings or pipe. Do not attempt to use standard bolts, machine screws, or non-NPT hardware with these bungs, as they will not seal properly and may leak.

Specifications:

Material: 1018 Cold Rolled Steel
Thread Types: 1/4" NPT or 3/8" NPT (tapered)
Installation Hole: 3/4" diameter
Flange Diameter: 1" (weld around flange)
Quantity: Sold in pairs (2 bungs per order)
Made in: USA

Common Applications:

Fuel tank petcock mounting
Oil tank fittings and bungs
Custom gas tank fabrication
Tank restoration and repair
Custom chopper and bobber builds
Cafe racer fuel tank modifications
Oil tank construction
Auxiliary fuel tank installations

Installation Instructions:

Proper installation is critical for leak-free performance:

Mark Location: Carefully mark the desired location for your petcock or fitting on the tank
Drill Hole: Drill a 3/4" diameter hole at the marked location
Test Fit: Insert the bung through the hole to verify fitment
Position Bung: Position the bung with the flange on the outside of the tank
Tack Weld: Tack weld the bung in place, checking alignment
Final Weld: Weld completely around the 1" diameter flange
Clean Welds: Grind and finish welds as desired
Pressure Test: Always pressure test your tank after welding to verify no leaks

Safety and Installation Notes:

Always drain and purge fuel tanks completely before welding
Never weld on a tank that has contained fuel without proper purging
Use appropriate welding techniques for thin tank material
Verify petcock or fitting thread size before ordering (1/4" or 3/8" NPT)
Apply thread sealant or Teflon tape to NPT fittings when installing
Pressure test all tanks after welding before use
Professional installation recommended if not experienced with tank welding

Safety Warning: Welding on fuel tanks is extremely dangerous if not done properly. Fuel vapors can ignite or explode. Only qualified professionals should weld on fuel tanks. Always follow proper safety procedures including complete fuel drainage, tank purging, and ventilation.

Each pair of TC Bros steel weld-in petcock bungs is precision-manufactured from premium American 1018 cold rolled steel to ensure reliable welding, proper thread engagement, and leak-free performance for your custom motorcycle fuel or oil tank.