If you have a Gardena T 1030 D watering timer, with the screw-on metal valve every year, the seals of the original solenoid are worn out, so it needs to be replaced. This here is the genuine spare part. Generally, the price + shipping costs add up to a large number for such an item, but unfortunately there is no variety, and after all, once every ten years is not a big cost. It comes with a sealing ring. Avoid using a metal valve because you will wear out the solenoid seals and then there is no spare part available.