This is the only pin that works with the Campy 11-speed chain. You need a new one every time you change the chain. BTD has greatly improved their response times and you'll get things right and fast at a great price.
Push pin in with a park 10 speed chain tool. I found the 11 speed chain tool pin that park makes to be flimsy as the chain tool pin easily breaks. Peen with park peening tool. Very solid connection, will never work it's way loose.
The only real problem is that it is best installed with a Campy 11sp chain tool, which isn't cheap. I still use my Campy 10sp chain tool for my 11sp chain and it's just fine. I'm not going to rush out and buy an 11sp chain tool.