Mate Series Straight Adapter

The Mate Series Straight Adapter (Part No. A3812) is a fluid-transfer coupling designed for pneumatic, hydraulic, and coolant line applications in automotive and industrial systems. This 3/8″ NPT to 1/2″ barb straight adapter enables secure, leak-resistant connections between rigid threaded ports and flexible hose assemblies, making it an essential component for transmission coolers, air conditioning systems, fuel systems, and custom plumbing configurations.

The 3/8″ National Pipe Thread (NPT) inlet accepts standard automotive fittings, while the 1/2″ barbed outlet accommodates hose with a corresponding internal diameter for reliable grip and minimal slippage during operation. NPT threads provide a tapered seal that strengthens as pressure increases, eliminating the need for separate thread sealant in most applications. The barbed design creates a mechanical lock with the hose wall, reducing risk of separation under vibration and thermal cycling—critical in mobile environments where components experience constant movement and temperature swings. Compact dimensions (1 × 1 × 2 inches) and minimal weight (0.05 lbs) facilitate installation in tight engine bays and custom plumbing layouts without adding bulk.

Technicians and builders rely on straight adapters like this when integrating auxiliary cooling systems, relocating fluid reservoirs, or retrofitting modern cooling architecture into custom vehicles. The straight configuration (no elbow or offset) suits applications where hose must run directly from a threaded port without angular deflection. This adapter is compatible with any hose rated for the fluid, pressure, and temperature range of your specific system—verify hose specification before installation.

Mate Series adapters are engineered to OEM specifications and widely used in marine engine systems, automotive performance builds, and industrial fluid-handling applications. Stock this part as a spare for routine maintenance or system upgrades to avoid downtime during repairs.