Reddit mentions of Superior Tool 03811 Eleven Inch Basin Wrench-Infinitely Adjustable 11" Spring Loaded Basin Wrench

It is a basin wrench

Here's an old post I had from /r/homeimprovement regarding a new home, hope it helps.

• Clean the gutters immediately and make sure the downspouts are feeding water AWAY from your foundation and down grade.
  
  
• Clean every single drain and make sure there is no hair clogging any of them. Especially since you just bought it and it's probably not even your hair. Don't just use drain-o, get down in there with one of these.
  
  
• Clean literally everything you can. Shop vac the basement/attic. Get the ceiling fan blades. Clean the kitchen cupboards and drawers. Dust all of the woodwork especially above doors and windows.
  
  
• Clean the windows and not just the glass. Get the window jambs and sills.
  
  
• Make sure the weatherstripping on all doors and windows is intact and seals well. If there isn't any, get some.
  
  
• Clean the dryer vent.
  
  
• Get the heating/cooling system cleaned. Boilers and furnaces are notorious for never being maintained until there's a problem and if you have an AC unit it will operate much more efficiently if it's clean.
  
  
• If there are appliances included, pull them out of their normal position and clean the shit out of them.
  
  
• Change all the lock sets, who knows who has a key to your house.
  
  
• Get a pressure washer. Don't skimp and get a cheapo electric you'll just regret it when it come time to clean anything besides a car. Clean your porch, decks, sidewalks, driveway. Seal your concrete after as well.
  
  
• Get quality yard maintenance tools. When string trimming or using a leaf blower I want to spend as little time possible doing it and not fighting to get the thing started. Check out the Echo PAS system, it's pretty damn good IMO and has a great consumer warranty. The Honda HRX lawn mowers are fucking fantastic, get one with the synthetic deck.
  
  
• If it snows where you live, get a quality snowblower. I will never in my life NOT be without one in the winter.
  
  
• Meet your neighbors, introduce yourself and your pets, if applicable.
  
  
• Make sure all your house numbers are CLEARLY visible from the street and make sure your mailbox doesn't leak.
  
  
• Buy a plastic deck box for package deliveries if you don't have a decent porch to keep that shit out of the weather.
  
  
• Get a basin wrench. It's so fucking worth it when you need to fix anything sink related.
  
  
• Replace the shower heads with something you like.
  
  
• Edge your sidewalk and driveway, it looks a million times better even if it's not in great shape to.
  
  
• Replace the rubber washers on your hose bibs.
  
  I'm sure there's more, but it's midnight and I'm sleepy.

The cost of a plumber got me thinking about a specific tool, a basin wrench , that basically makes it a bazillion times easier (and cheaper) to tighten the big awkward nut that attaches the base of your sink doohickies to the underside of your sink/kitchen counter. Probably a lot of tools out there that make diy repairs a lot easier.

A few tips I didn't see already listed:

• Plumber's putty: use it when you install the faucet, like you're supposed to. I didn't when I replaced my kitchen faucet, and I really need to take it apart and do it right.
  
• Basin wrench, like this - I didn't know what one was until I saw them mention it on Ask This Old House, and it made installing our new bathroom vanity a breeze.

Why do you recommend the socket type over the open jaw/telescoping type?

https://www.amazon.com/Superior-Tool-Eleven-Wrench-Infinitely-Adjustable/dp/B0000CBJD4