LINCOLN INDUSTRIAL LNI-5853, 6 Hydraulic Extension & Coupler, Grease Gun Accessories The LINCOLN INDUSTRIAL LNI-5853 Hydraulic Extension & Coupler enhances the reach and flexibility of hand-operated grease guns, allowing for lubrication in hard-to-access areas. This 6 extension ensures efficient and precise grease application for various maintenance tasks across diverse industries, including automotive, agriculture, marine, and construction. Featuring a 1/8 NPT male thread, the LNI-5853 is compatible with most standard grease guns and is designed to withstand high-pressure applications up to 6,000 PSI.