It replaces the existing sump plug, making oil changes simpler and somewhat cleaner and at times less painful process.

F-106
As far as I know, none of the sponsors for this site sell this item. Please let me know and remove this post if in violation.
Another car forum (clubcj.net) are offering a Group Buy with the following discounts:
10+ valves – 10% off
20+ valves – 20% off
50+ valves – 25% off
100+ valves – 30% off (~A$21 each)
The Chief Buyer is based in Victoria so the order will be sent to Victoria first, distribution to other states at additional cost based on the weight and size of units ordered. Ideally, best to get a few per state to justfiy postage costs, then distribute at your leisure.
Personally, prefer the nippled units (tell me who doesn't?! ;)) and are a few bucks more.

F-106N
I will open the EOI until Tuesday 7th April unless withdrawn earlier.
Cheers
Al