can you guess what this is?

It's an RV air filter! John says ours looks like it has never been changed! After all the thousands of dollars spent on oil changes, one would think that Freightliner would replace the air filter! Nope! Our last trip the RV was, as John would say, "sucking wind" so he decided to take the old air filter off for an inspection, in 30 degree, sideways rain weather with snow imminent.  After being 3 days late from Freightliner parts, he picked up the new one today.  What a difference! 

He will try it out tomorrow after all the joint sealers are cured.  Have I told you lately how amazing he is?