The water pipe of the sink is mostly made of PVC plastic wire hose. The leakage of the downpipe is generally caused by a broken pipe or a leak in the interface. If there is a leak in the lower pipe, first you need to observe where the leak is. Go with the kitchen faucets manufacturers and see how to solve these problems.
When installing the lower head, there will be a matching washer on the inside and the back of the water drain hole of the sink. Generally, the inside of the sink is a thin washer. The back of the sink to the water hole is a thick washer. Both washers are held in place by the upper and lower combined lower heads. If it is leaking here, check if the two washers are well padded, if there is any padding and the gasket is broken.
If the interface of the pipe leaks, you need to use a roll of white raw material. Because the downpipe is made of PVC, it will react to the expansion and contraction of the hot and cold water. Therefore, at all the interfaces, a few turns of the raw material tape are wrapped to ensure the stability and sealing of the water pipe connection.
The downpipe has an odor, and there are two reasons for the odor. The first is that the downpipe does not have a trap to isolate the odor, and the other is that the tail port of the downpipe is not connected to the pipeline. Generally, in order to facilitate cleaning or unblocking the plug, the diameter of the tail port of the down pipe is smaller than that of the pipe. If it is usually put directly into the pipe, the tape is counted as a ball. After a long time, the tape will be dirty and lose its viscosity. When it smells, it will appear.
information about kitchen faucets manufacturers : https://www.afastainlesskb.com/product/stainless-steel-faucet/kitchen-faucet/