A-P211313-AI Dust Plug, 3/8", Orange (10 pkg)Ten New Aftermarket Replacement Hydraulic Coupler Dust Plugs, 3 8", Orange (10 Pack) This package of 10 orange 3 8" dust plugs protects hydraulic quick coupler nipples and connecting surfaces from dirt, dust, and contamination when couplings are disconnected. The orange color coding makes it easy to identify and match hydraulic lines at a glance a widely used practice on tractors, implements, and other farm equipment with multiple hydraulic circuits.