3/8NPT Ano-Tuff Internal Plug

The EARLS 3/8 NPT Ano-Tuff Internal Plug is a precision fluid system component engineered for hydraulic and pneumatic applications requiring robust, corrosion-resistant closure. This black anodized aluminum fitting delivers reliable port sealing in demanding environments where aluminum construction provides weight savings without sacrificing durability or integrity.

The 3/8-inch NPT (National Pipe Thread) connection is the industry-standard thread form for hydraulic and pneumatic systems, ensuring compatibility with equipment using conventional male NPT fittings. Allen head design allows secure installation and removal with standard hex key tools, while the anodized aluminum construction resists oxidation and wear in both indoor shop environments and outdoor applications exposed to moisture and temperature cycling. At just 0.02 lbs, this fitting minimizes system weight—a critical consideration in aerospace, motorsports, and portable equipment applications.

Suitable for professionals maintaining custom hydraulic lines, performance fuel systems, air brake assemblies, and pneumatic control circuits. EARLS components are recognized throughout competition and off-road motorsports for meeting OEM specifications and surviving high-vibration, high-temperature operational conditions. This plug serves as a temporary closure, testing port cap, or permanent end-run fitting depending on system architecture and maintenance needs.

The anodized finish provides superior corrosion resistance compared to bare aluminum, extending service life in humid or salt-air environments. NPT threads are tapered, creating a pressure-seal interface without requiring additional sealant tape for many industrial applications, though thread tape or pipe dope is recommended for high-pressure systems to ensure zero-leak performance.

Verify NPT thread compatibility with your existing male fittings before purchase to ensure proper fit and pressure integrity.