Up for auction is a Edlebrock Marine engine part.  I'm not exactly sure what this is !   I purchased it along with some other Marine engine exhaust parts.  I'm not sure if it has ever been used.  I tried to take detailed pics to show condition.  I'm sure you Boat guys know what you are looking at !   I do have another one.  Feel free to email me and let me know if you're interested in the pair.