Doing the usual at 2 in morning, trolling through the pages on Fleabay and came across a valve that bolts in to replance your normal sump bolt.
Personally I am bit unsure of using it due to it's location and easily getting damaged but thought I would post it in case anyone else was interested.
http://www.ebay.com.au/itm/Fumoto-En...ht_2159wt_1170