I'm still having trouble figuring out which part you broke... Is it attached to the more-or-less flexible hose that runs from the CCV (crankcase ventilation) hockey-puck on top of the valve cover or is it part of the pre-heater (that's supposed to warm up those vapors when the engine's cold) ? There's an odd adapter that's supposed to sort of plug onto that pre-heater (if you squeeze the outer ring)... If what you see coming out of that pre-heater looks like a pipe-nipple, you could improvise... many people put some type of oil trap / separator... (see
http://forums.tdiclub.com/showthread.php?t=90355&page=4 ,
http://forums.tdiclub.com/showthread.php?t=142016 and
http://forums.tdiclub.com/showthread.php?t=121576 ... there are many other designs...)
Yuri