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This is on a valve for a fancy walk in tub. The nut tightens it against the top of the tub to hold it in place.
But I have no idea what this kind of nut is called, nor what tool to use to properly tighten it. I can get it kind of tight using vice grips, normal wrenches, and hammering it with a flat head screwdriver.
Some of them are about 2 inches in diameter, others 2.5-3 inches.
But surely there is a proper tool for this? What's it called?
For slotted collet nuts I use either an adjustable or slotted spanner wrench.
Although you can nearly always use something from a normal toolbox, a hook spanner is ideal. One of the top two in this image would work (the third is a pin spanner):
The usual procedure is to use a slotted screwdriver against the tabs, and strike lightly with a hammer or mallet.
