Whats This Pipe Do & Whats It Called?

[K1ngsteve888]

http://img169.imageshack.us/img169/4877/p1020288lh7.jpg (http://imageshack.us)

mines doesnt have this plumbed in so wondering whats it for

cheers

[jalfrezigazee]

it's name is 'John' and it takes a small bit of the crank case gas straight to the inlet manifold via a one way valve

[Enkidu]

Damn I always called it Pete lol I dont see the point of it though...