Purge valve

[CMGRover]

Which one is the correct part...
This
http://www.roverparts.com/Parts/MAP500100G

Or

https://www.fcpeuro.com/products/la...range-rover-sport-genuine-rover-rov-wtr500020

Mine is sticking closed and open. Is the only difference between the two is one has the hoses?
Thanks!

 

[CMGRover]

So it looks like the less expensive one is the leak detection pump and the other one is up in the engine bay. I'm assuming I need the engine bay one?