MACS Header Adapter Pipe Silicone Connector 5/8 inch I.D., part #9171 (#9290) (for .35-.90 engines).
Fits over 3/4 inch O.D. aluminum tubing and 5/8 inch as well.
This is same as part number #9290.
2 inch long.
Item is New.
See my other MACS Products listings. Thanks for looking.