Beautiful design. Works well. The price is good. The kit does not include a lock nut and O-ring. When I opened it I thought they were missing, but the image is shown without both. It's okay, I should have looked better. I looked at a few before adding it to my cart and picked the wrong one. Didn't even notice. I figured the lock nut was pretty standard for electrical box fittings and I wanted a rubber grommet as well. I guess I'll have to dig into my nuts and bolts if I decide to forego a seal. Or buy another with one. It seems cheap to save those 3 cents for the right item. Definitely a locknut.