Hi, I have an A class Pilote G 600. The spindle that operates the valve on the grey water tank has sheared off. I must admit it's not the best design, it's operated by a metre long flexible cable. I am thinking of incorporating another valve nearer the outlet. The piping is 40mm diameter and I don't seam to be able to source a suitable part. I can get a smaller diameter valve but would need a reducer to fit it. Has anyone had a similar problem or any idea how I can remedy this problem