Using the Furick #8 Pro Pyrex cup is easy. First, mount it using the supplied o - rings. It works well for DC steel and AC aluminum welding. If you have a #17, #18 or #26 size torch, make sure to get a #17 kit. For #9 or #20 torches, use a 45V44 gas lens. When using it, keep in mind that import brand accessories might not give the best results. To maintain the cup, clean it regularly after use. Don't exceed the 200 AC amp limit to avoid damage to the cup.