so far it is OK, no leaking.
I have had plastic ones before and they get all faded and then they crack. This one stays nice looking. I have it on the end of a soaker hose in the garden.
I appreciate a simple, well-made item that meets its job requirements. This qualifies as one of those items. It is solid, with well-formed threads. It screws on smoothly to the end of my soaker hose as needed. I doubt I'll have to replace this cap anytime soon. Recommended!
Works as expected.