Air Bleed Nipple

Having been caught out by an air lock after last draining the the system to replace the camshaft causing the engine to boil over through the radiator cap. I decided that I will fit one of these to make it easier to refill the system.

Another benefit of fitting thisis that it provides a little more room under the pipe for all the distributor leads.

The screwed nipple has the seal on the flange of the screw. I modified the screw by grinding a groove into the thread so the gasses release easier without having to unscrew the screw too many turns with the risk of it popping out!