I'm not to sure where this go into. Not sure if it even an evap please help.

I dont know where this would go into. Please help!

 

https://www.clublexus.com/forums/ls-...procedure.html

This is a very informative thread on the EVAP system but it's mostly diagrams. There is a pic at post #79 that might help you...
Type "LS430 EVAP hose" into Google and look at the pics

 

Looks like the nipple on the black box is broken

 

More resources https://duckduckgo.com/?q=LS430+EVAP...ages&ia=images

 

The same thing happened to my car. The box is listed as a hose in the parts catalog. It is completely hollow inside. I eliminated mine years ago with a piece of bulk emissions hose from the auto parts store. No issues in 30k miles.

 

I replaced that small black box on my car along with every one of those small vacuum hoses (from Lexus) in the engine compartment. It was approximately $30+ for all the hoses and the box. Unfortunately it did nothing to fix my DTC code (PO440) and I have learned to live with it as the car runs and drives like a top otherwise. Gas mileage etc are all good.

 

Here is the part you will need. There are several listed on eBay for around $15.