Drain Plug Kit 3/8in NPT Aluminum Bung

The Drain Plug Kit 3/8in NPT Aluminum Bung from Allstar Performance is a precision-engineered solution designed for engine builders, fabricators, and motorsports professionals who need reliable fluid drainage or pneumatic access points on custom and competition engines. This weld-on bung kit addresses a critical need: creating secure, threaded ports on aluminum engine blocks and manifolds without compromising structural integrity or introducing corrosion risk. Whether you're building a race engine, hydraulic system, or custom cooling application, this aluminum bung provides a permanent, leak-free connection point.

The 3/8 inch NPT (National Pipe Thread) aluminum bung is manufactured to exacting standards, offering compatibility with standard NPT fittings, hoses, and plugs found in professional machine shops and engine facilities. Aluminum construction ensures lightweight performance while resisting corrosion in harsh operating environments typical of high-performance racing and marine applications. The weld-on design means this bung becomes a permanent part of your assembly—once welded in place, it provides a solid, vibration-resistant mounting point that will not loosen or fail under extreme heat cycling or pressure fluctuations. The natural aluminum finish accepts welding readily and can be anodized or painted for additional protection if required.

Mechanics and engine shops benefit most from this kit when constructing custom cooling systems, drain manifolds, or test ports on one-off engine builds and prototype development. Installation requires welding to aluminum—a skill standard in fabrication shops—making this ideal for professional environments where precision and durability are non-negotiable. The compact form factor (3.5 x 0.8 x 4.55 inches) fits tight engine compartments and custom manifold designs. Pair this bung with your 3/8 NPT plugs, drains, or quick-disconnects for complete system integration on race engines, custom hot rods, and hydraulic test rigs.