I bought it because the diaphragm in my house had become ragged if I was using an old one. Quality is no problem. As its name suggests, it will drain quickly. Since the exterior is made of aluminum and it is durable, it is saved if possible if possible only if diaphragm is taken out as a supplementary part.
Even without it, the machine moves for the moment, but the sound of the air leak is always noisy, so it is a troublesome thing if there is nothing to do. As a structure it is very simple, the internal rubber diaphragm deteriorates and it becomes useless, but this quick exhaust valve is sold as an assembly, it becomes very expensive. Hopefully it would be appreciated if only diaphragm could be sold, but as it is still the total performance as a product, it probably will not come true. However, I think that it is very easy to get such a minor product. I do not know when the next time will be broken, but I will purchase it again at that time.