Hell everyone, i have a 2003 land rover discovery. And wanted to know if anyone knew the name of the plastic piece the lower coolant hoses connect to it has three outlets.

 

Don't know the name and I don't think you can purchase it seperatly but rather with the spider look hose grouping.

 

Are you talking about the t/stat on the right side of the radiator?

 

If number 16 in attached diagram, it will be the thermsotat, you want a new one from Justin at Lucky 8, ask for the 82 C soft spring unit and your truck will run almost ten degrees cooler, saving lots of things in the process.