Nipple clamps that you secure with a lever clamp. Very easy to use, lever down and the clamp closes, lever up and the clamp opens. You can also leave this clamp half closed (or half open, if you're an optimist) if you want to be nice to the nipple in question.
Because the lever can remain in any desired intermediate position, these clamps have a large range, from"not too bad for a nipple clamp"to"oauwauwauwauw".
