The inside is metal with a channel running around the middle. Not threaded. Looks like where bearings would be.
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jelliotlevy: "Carbon dating is only accurate + or - a couple of hundred years. I think the original poster should question his wife carefully. My alternate hypothesis is that she has a secret lover who drives a beat up old car, unbeknownst to him"

Yeah, I know who it probably is. We are gonna have a BIG sit down tonight.

 

How 'bout geographically identify the material source to either an asian or american plastic supplier. He could at least elinimate it if american made from an american plastic supplier/factory.

 

This thread just got really interesting.

 

I looked at the top pic again and noticed the brand DAYCO.

TENSIONERS

 

Good find Baked, lol someone is stranded somewhere with slack belts.

 

lol i cant handle this thread!!!!

 

A second thought...it could also be the o-ring to the time compression chamber of a Flux Capacitor. Make sure your car isn't a time machine by flipping the hazard lights switch on and off 5 times while counting to 3 in letters.

 

You know, I have been feeling a bit shifty today.

 

GMC belt tensioner

It's the DAYCO NO SLACK Tensioner !!!!!!!!!!!!!!!!!
Never will a higher quality pulley fall off your truck, get one NOW!!!!!
(GM is proud to equip all their trucks with Dayco More Slack products)

 

The fact that this probably came from a GM truck makes it all the more hilarious!

 

Great finds..That's definitely it. Not from the Fit then...Yippee!!!!..

 

Looks like a kenuker valve to me, it doesn't matter if it falls off though because like transmissions you have two.

 

this thread was too hilarious. BUMP!!!