I have a 2007 Eagle and the mains tap was a bit of a pain especially when you turned it on fast to fill up a kettle or such and the spout would blow out with the pressure and wet the front bed, once with the missus in it. Needless to say it got changed.
The original tap was P/N 005895 and the tap I replaced it with is P/N 005990
If you go to
http://www.camec.com.au and select the plumbing tag then scroll down a few pages you will see the old and the new on the same page.
Removed the old tap and the new one fits in the same hole and the connection under the sink screws straight onto the new tap. Too easy!
The new tap is smaller, has better flow control and the spout does not come off. Cost me $91 ish about a year ago.
It was the only tap I could find in the world that would fit, allow the bed rails to slide back in and not require any other parts.
Note that my camper is a 2007 jayco eagle, dont know about a 2011 penguin