Good guess, but no...not part of a turtle. After someone guesses correctly, I'll explain the gas tank allusion. (Oh, Kyle...Not a clit)
I guess you're right Shane....( too many hints ) It's a hemipene....the gas tank reference is because Snakes mate all twisted up like the twist ties on loaves of bread, and the snakes never know if they're gonna hang left or right. Therefore they are prepared either way. They have a penis that has a cleft in it much like a valentine. The hooks are to prevent "slippage". here's some more info...