Can anyone tell me how this should be connected up properly as I can't seem to get mine to work, iv got a hose from the pump going to the washer bottle with a t piece off it, which has a little hose on it with another t piece that then has a hose from each side going to the washer jets, iv also put a non return valve about 5" before the water bottle but it's not working properly, there also seems to be air in the hoses all the time which I can't get rid of, any help with this really appreciated as it's booked in for it's mot tomorrow and it's going to fail on this so going to have to cancel it

 

check the valve is the right way round does the pump squirt unconnected if yes are the squirters blocked