While I would never question the integrity of the seller, there is certainly no finer shop I the business; I have to question that this is NOS. It definitely appears to have been previously installed. You can clearly see the marks from the gasket, and the fuel line. At least twice in the past I have bought "NOS" parts only to find on close inspection, that they were actually used take off parts put back into the box the replacement parts came out of. In both cases it was an unintentional mistake and I received full refunds. After years sitting on a shelf no-one knew what was actually in the box. Without a very close inspection by a knowledgeable person, it is often hard to tell if a part has been previously installed.