Coilhose Pneumatics 581 Pneumatic Hose Coupler 3/8 Mnpt

Product Description

The COILHOSE PNEUMATICS 581 is a pneumatic hose coupler designed for use in industrial compressed-air systems. It features a 3/8-inch male NPT (MNPT) threaded connection and a 3/8-inch body diameter, and is built from nickel-plated steel for corrosion resistance and long service life. The coupler is rated for a maximum working pressure of 300 psi and handles temperatures from -40 degrees F to 250 degrees F. It follows the Industrial Interchange standard, making it broadly compatible with air tools, hoses, and fittings used in shop and field environments. Installation is handled by HVAC technicians, mechanics, and industrial maintenance personnel.

This coupler is suited for residential shops, commercial facilities, and industrial maintenance operations where Industrial Interchange pneumatic fittings are the standard. It is a threaded coupler half intended for use with air compressors, blow guns, impact wrenches, pneumatic nailers, and similar air-tool applications. The MNPT thread connects directly to hose end fittings, manifolds, or tool inlets. Its nickel-plated steel construction withstands the demands of high-cycle shop environments.

Key Features

• Industrial Interchange standard — compatible with widely used pneumatic tool and hose fittings
• 3/8-inch MNPT threaded connection for direct installation on hose ends or tool inlets
• Rated to 300 psi maximum working pressure
• Operating temperature range of -40 degrees F to 250 degrees F
• Nickel-plated steel construction for corrosion resistance and durability
• 3/8-inch body diameter — standard size for mid-range air tool applications

Compatibility

Designed as an OEM-style replacement or drop-in addition for Industrial Interchange pneumatic systems using 3/8-inch MNPT threaded connections.

Installation Notes

This coupler is installed by mechanics, HVAC technicians, or industrial maintenance personnel working on compressed-air distribution systems. Depressurize the air line completely before removing or installing any pneumatic fitting. Apply thread sealant tape to the MNPT threads per standard practice to prevent air leaks. Tighten to snug-plus-hand-tight using an appropriately sized wrench — avoid overtightening, which can crack the body or damage thread sealing.