this is gettin' old...

[Jaxonalden]

You'll need numbers #12 & #13.

https://techinfo.porsche.com/techinfo/pdf/en/catalogues/E_986_KATALOG.pdf

I'm still checking but that is a coolant line so you'll have to drain the coolant system also. If you're that far, with the system drained, you might think about replacing the water pump, the plastic impellers are known to disintegrate. You can pick up a HD OEM with a metal impeller from EBay.

http://cgi.ebay.com/ebaymotors/Porsche-911-996-986-BOXSTER-S-CARRERA-2-4-Water-Pump_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c66Q3a 2Q7c65Q3a12Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q 3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZite m350144720284QQitemZ350144720284QQptZMotorsQ5fCarQ 5fTruckQ5fPartsQ5fAccessories