OIL PAN DRAIN VALVE SPECIAL - we are running a special on our oil pan drain valves for 928, 944, 968 models now. Regularly $29.50, now $26.50. They work great, no leaks, not even a drip! Valve has a spring detent so it can not be opened accidentally. And it solves the worry about stripping you oil pan threads out... you will install this once and then never have to turn your drain plug again.
www.928motorsports.com/parts/oilpandrainvalve.php 
