LINCOLN INDUSTRIAL, 2.5 Length, Durable Air Coupler, Air Coupler, Metallic The LINCOLN INDUSTRIAL LNI-815 is a durable air coupler designed for long service life and easy connections, even under severe operating conditions. This coupler ensures maximum air flow, contributing to the efficient operation of pneumatic tools and equipment in heavy-duty applications. Its robust construction and positive action locking mechanism provide a secure and leak-proof connection, minimizing downtime and maximizing productivity.