2" Blue Reflective Trailer Hitch Cover Plug Insert 2" Blue Reflective Trailer Hitch Cover Plug Insert Protects receiver tube when not in use, will keep the winter snow and ice outside, rather than inside. Keep out Mud, Dirt, and Pests. Reflective Blue Made of Durable Reflective Blue Vinyl. The cover is made from black ABS plastic, smooth black plastic hitch tube cover. No pin or clip required to hold in place, Installs in Seconds.