Injector rail schrader Valve?

[NickOcean]

As you may have seen from the ''Dusty TVR'' thread, Iam replacing the fuel lines. there is a shrader valve on the injector rail, at least i assume thats what it is! What is this for? I can only think its for depresserizing the injection system prior removing the fuel line pipe, rail. And/or bleeding the system once fuel is reinstated to the rail.

Can anyone enlighen me as i can find no referance to it in my manual.

Many thanks

[Belle427]

Pressure testing mainly but can be used for the other methods you describe.