Hello, I have not succeeded in installing a double check valve. Reason: petrol hose to storr – the valve coupling is not possible. Here is a sketch. This looks simple, but to bend the hoses like this and then pull the coupling apart is not possible. Even longer hose pieces I have tried…. but that is not possible either, because then the valve is pushed back so far that it hides between rocker box and frame train / tank so that it is nic And it’s on the rocker box and it’s getting hot. I’ve built the normal bridge again.