ok so my multipla 2007 washer motor works ok with noise but just a dribble coming out, disconnected the 3 piece non return valve and connected to just the drivers side works brilliantly and same with the passenger side soon as i reconnect the non return t piece just a dribble, so my question is has anybody had the non return valve fail ? and other ideas that might cause this ? at the moment i have just the drivers side and rear wiper connected and they are working fine, been googling but can't seem to find a non return valve for a 2007 fiat multipla so anyone got a link please,JP