ARB NPT Hose Coupling 1Pk — US‑Standard 1/4" NPT Thread, Durable Replacement for Air & Fluid Lines

ARB Hose Coupling US Std NPT 1Pk (740112) is a single, US-standard NPT hose coupling engineered for reliable, leak-resistant connections in demanding automotive and off-road environments.

This compact coupling is a purpose-built replacement or upgrade part from ARB, a well-known manufacturer of high-quality automotive components. It’s made to meet standard NPT threading and rugged use, so it integrates cleanly with compatible hoses, fittings, and compressed-air systems often found in workshops, garages, and overland kits. Built for durability and repeatable performance, the 740112 part is a practical choice when you need a dependable threaded connection without modifying existing plumbing.

Will this coupling fit my existing NPT hoses and fittings?

If your system uses US-standard NPT threads, this ARB coupling is designed to thread in directly with compatible male or female NPT components. Verify that the thread size and pitch match your hose or adapter before ordering to ensure a proper seal and correct assembly.

• Manufactured to US-standard NPT thread dimensions for broad compatibility
• Ideal for threaded air and fluid lines that require a standard NPT join
• Sold as a single-piece pack (1Pk) for targeted replacements

How does the ARB coupling hold up in heavy use conditions?

This coupling is produced by ARB with a focus on longevity under real-world stresses. Materials and finishes are selected to resist wear, repeated assembly cycles, and common workshop exposures—helping reduce leaks and maintenance downtime.

• Engineered and tested for durability in automotive and off-road applications
• Designed to withstand repeated thread engagement without degrading the seal
• Meets or exceeds applicable standardized testing for reliable field performance

What are the practical installation tips for a secure seal?

Proper installation keeps thread sealants and mechanical load in check. Use an appropriate NPT thread sealant or PTFE tape, and tighten to recommended torque for your system to avoid overtightening or thread damage.

• Clean threads before applying PTFE tape or thread compound to ensure a tight seal
• Wrap PTFE tape clockwise around male threads for consistent engagement
• Hand-start threading to avoid cross-threading, then tighten with a wrench to spec

Can this coupling be used for both air and fluid applications?

The ARB NPT coupling is suitable for many air and non-corrosive fluid uses when installed with compatible hoses and rated system components. Confirm chemical compatibility and pressure ratings of your whole assembly before using in fluid transfer or pressurized systems.

• Appropriate for compressed-air lines and many standard fluid lines when matched correctly
• Check system pressure and fluid compatibility with materials used in the coupling
• Pair with ARB or other rated components to maintain overall system safety

Who is this for: This ARB Hose Coupling US Std NPT 1Pk (740112) suits mechanics, overlanders, and DIY technicians who need a reliable NPT-threaded coupler for routine maintenance, repairs, or upgrades. It’s especially useful when you want a straightforward, single-unit replacement that adheres to industry thread standards, provides long service life, and integrates easily into existing hoses and fittings without custom modification.