Who knows what this is used for? And what it's called

>>1017725
Basin wrench
Install older style faucets under the sink easier

>>1017730
Thank you anon

>>1017733
Fucking useless tool until you absolutely can't get the job done without it. Then its the only tool you don't have when all the shops are closed.

>>1017736
Fucking THIS.

>>1017730
>Install older style faucets under the sink easier
Yes,,,, but not really any more.
Nowadays you'd only need one of these things to get a really old faucet OUT of a sink.
At least in the USA--the new faucet will have plastic nuts that you just hand-tighten, because they have gaskets in them and you don't need them very tight to seal.

Tap wrench/spanner, its for getting to nuts you cant get to wothout removing plynth/basin. I think its handy but i do plumbin so yeah