If there are any questions about a particular line item as to what it is, just ask. But you can go to their site and just punch the part number in and usually see a picture. One noteworth item, I believe the socket with barb (or the white airline connector you get at bvm's website for quick disconnect) are less expensive at BVM'S SITE than at mcmaster carr. I don't know why. I overpaid bigtime on this item without really checking into it. Other than that, you'll save gobs of money on these type of items rather than at your LHS, or BVM. Especially the aeropoxy stuff. BVM charges like $60.00 for the gun that mcmaster sells for $20.00 and he probably gets for 12 to 15.