Pro-lube HC/21/N Grease Gun Quick Lock Coupler 8000 Psi

Product Description

The PRO-LUBE HC/21/N is a quick lock grease gun coupler designed for high-pressure lubrication service in industrial and fleet maintenance applications. Built from steel with a satin finish, it connects grease guns to standard zerk fittings through a fast-engage locking mechanism rated to 8,000 psi operating pressure and 14,000 psi burst pressure. The 1/8 inch Female NPT thread fits directly onto most standard grease gun hose ends. Lubrication technicians, mechanics, and maintenance professionals install this coupler as a replacement or upgrade when a worn or leaking coupler causes grease loss or fitting disengagement under load.

This coupler is suited for use in automotive shops, heavy equipment maintenance bays, agricultural equipment service, and general industrial lubrication programs. The quick lock design allows single-handed connection and disconnection at the zerk fitting without tools, reducing service time on high-volume lubrication routes. It is appropriate for use with standard petroleum-based greases and most synthetic greases delivered through hand-operated or pneumatic grease guns.

Key Features

• 8,000 psi operating pressure rating for high-pressure grease gun applications
• 14,000 psi burst pressure for a wide safety margin under surge loads
• Quick lock engagement mechanism allows fast single-handed connect and disconnect
• 1/8 inch Female NPT thread for direct connection to standard grease gun hose ends
• Steel construction with satin finish for durability in shop and field environments
• Compact 4.53 inch length keeps the grease gun assembly maneuverable in tight spaces

Compatibility

Designed as a replacement or service coupler for grease guns equipped with a 1/8 inch Female NPT hose end connection, compatible with standard zerk grease fittings used across automotive, industrial, and agricultural equipment.

Installation Notes

Installation is performed by lubrication technicians and general mechanics and requires no special tools beyond thread seal tape or thread sealant compound for the NPT connection. Relieve all pressure from the grease gun before removing the existing coupler and threading on the replacement. Hand-tighten the NPT connection first, then snug with a wrench - do not overtighten steel NPT fittings, as this can crack the fitting body. Verify the quick lock mechanism engages and releases cleanly on a zerk fitting before returning the gun to service.